### List of trigonometric identities Trigonometric Functions

nn) (cx ncx nn). mathsgenie.co.uk Write your name here Surname Other Names AS/A Level Mathematics Trig Identities Instructions вЂў Use black ink or ball-point pen. вЂў If pencil is used for вЂ¦, View List_of_Trig_Identities.pdf from MATH 4U0 at Mississauga Secondary School. Unit 3: Trigonometry and Trigonometric Functions List of Trigonometric Identities Reciprocal.

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Magic Hexagon for Trig Identities. Trig-identities. 1. Trig Identities on the six trigonometric ratios: (Note: trig is an abbreviation for trigonometric. We will use trig for the word trigonometric to avoid repetition and therefore boredom.), What trig identities can I create that I have not yet seen? What Polar graphs can I create by messing with trig functions? What makes a pretty graph instead of one that just looks messed up? Can I come up with a simpler method of doing things than I am being taught?.

Trigonometric Identities are useful whenever trigonometric functions are involved in an expression or an equation. Identity inequalities which are true for every value occurring on both sides of an equation. Geometrically, these identities involving certain functions of one or more angles. Trigonometric Identities. Trigonometric identities are identities in mathematics that involve trigonometric functions such as sin(x), cos(x) and tan(x). Identities, as opposed to equations, are statements where the left hand side is equivalent to the right hand side.

USEFUL TRIGONOMETRIC IDENTITIES De nitions tanx= sinx cosx secx= 1 cosx cosecx= 1 sinx cotx= 1 tanx Fundamental trig identity (cosx)2 +(sinx)2 = 1 1+(tanx)2 вЂ¦ Lecture Notes Trigonometric Identities 1 page 3 Sample Problems - Solutions 1. tanxsinx+cosx = secx Solution: We will only use the fact that sin2 x+cos2 x = 1 for вЂ¦

Complex logarithm identities. The complex logarithm is the complex number analogue of the logarithm function. No single valued function on the complex plane can satisfy the normal rules for logarithms. However a multivalued function can be defined which satisfies most of the identities. Trig Formulae & Equations. Welcome to highermathematics.co.uk A sound understanding of Trig Formulae & Equations is essential to ensure exam success.. Passing the fast paced Higher Maths course significantly increases your career opportunities by helping you gain a place on a college/university course, apprenticeship or even landing a job.

Table of Trigonometric Identities Definitions sin a c T cos b c T tan a b T Basic Identities 1 sin csc T T 1 cos sec T T 1 tan cot T T 1 cot tan T T 1 csc sin T T 1 sec cos T T Periodicity sin 2 sinT S T cos 2 cosT S T tan tanT S T Pythagorean Identities sin cos 122TT sec tan 122TT csc cot 122TT Quotient Identities sin tan cos T T T cos cot sin Trigonometric Identities are useful whenever trigonometric functions are involved in an expression or an equation. Identity inequalities which are true for every value occurring on both sides of an equation. Geometrically, these identities involving certain functions of one or more angles.

What trig identities can I create that I have not yet seen? What Polar graphs can I create by messing with trig functions? What makes a pretty graph instead of one that just looks messed up? Can I come up with a simpler method of doing things than I am being taught? 1/28/2014 Physics Handout Series.Tank: Basic Trig Trig-2 The trigonometric functions are geometric in nature so geometric arguments are to be used to develop the fundamental identities and to prove that: 0 sin( ) Limit 1 This limit plus a few trigonometric identities are required to the prove that: sin( ) вЂ¦

What trig identities can I create that I have not yet seen? What Polar graphs can I create by messing with trig functions? What makes a pretty graph instead of one that just looks messed up? Can I come up with a simpler method of doing things than I am being taught? Pythagorean IdentitiesPythagorean Identities sin 2x + cos2x = 1 cos2x = 1 вЂ“ sin 2x sin 2x = 1 - cos2x tan 2x вЂ“ sec2x = -1 1 + tan 2x = sec2x 1 + cot2x = csc2x Sum or difference of two angles sin(a + b) = sina cosb + cosa sinb cos(a + b) = cosa cosb - sina sinb sin(a - b) = sina cosb - cosa sinb cos(a - вЂ¦

Trigonometric Identities In this unit we are going to look at trigonometric identities and how to use them to solve trigonometricequations Trigonometric Identities mc-TY-trigids-2009-1 In this unit we are going to look at trigonometric identities and how to use them to solve trigonometric equations. In order to master the techniques explained here it is vital that you undertake plenty of practice exercises so that they become second nature.

Mar 17 - Today we began Proving (Verifying) Trig Identities! You formed small groups and were assigned 6 problems from the list of 31 to form a portfolio. Be sure to follow the directions and ask questions if needed. McKinley and Nathan R., you will work together as Group 11, and will complete #1, 7, 12, 19, 25, and 27. We will work on the Lecture Notes Trigonometric Identities 1 page 3 Sample Problems - Solutions 1. tanxsinx+cosx = secx Solution: We will only use the fact that sin2 x+cos2 x = 1 for вЂ¦

Trig Identities Sorting Activity is an interactive and hands on way for students to practice using trig identities to simplify expressions involving trig functions. Students simplify 20 trig expressions to one of the six trig functions (sine, cosine, tangent, cosecant, secant, or cotangent). When completed students will have three or four trig List of trigonometric identities 1 List of trigonometric identities Cosines and sines around the unit circle In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every single value of the occurring variables. Geometrically, these are identities involving certain functions of one or more

Trig-identities. 1. Trig Identities on the six trigonometric ratios: (Note: trig is an abbreviation for trigonometric. We will use trig for the word trigonometric to avoid repetition and therefore boredom.) Table of Trigonometric Identities. Download as PDF file. Reciprocal identities. Pythagorean Identities . Quotient Identities. Co-Function Identities. Even-Odd Identities. Sum-Difference Formulas. Double Angle Formulas. Power-Reducing/Half Angle Formulas. Sum-to-Product Formulas. Product-to-Sum Formulas. Download as PDF file [Trigonometry] [Differential Equations] [Complex Variables] [Matrix

Alternative pdf link. [Trigonometry] [Differential Equations] [Complex Variables] [Matrix Algebra] S.O.S MATHematics home page Product Identities. The hexagon also shows that a function between any two functions is equal to them multiplied together (if they are opposite each other, then the "1" is between them):

19/10/2018В В· Free Worksheets Library Download and Print Worksheets from trig identities worksheet pdf , source:comprar-en-internet.net. When you arrive on their page that is primary, all youвЂ™ve got to do is either select one of several templates they give or Start Fresh. Trig Identities вЂ“ Trigonometry is an imperative part of mathematics which manages connections or relationship between the lengths and angles of triangles. It is a significant old idea and was first utilized in the third century BC. This part of science is connected with planar right-triangles (or the right-triangles in a two-dimensional plane with one angle equivalent to 90 degrees).

### Trigonometric Identities University of Sheffield

What are the Basic Trig Identities?рџЌ. Trigonometry (trig) identities. All these trig identities can be derived from first principles. But there are a lot of them and some are hard to remember. Print this page as a handy quick reference guide. Recall that these identities work both ways. That is, if you have an expression that matches the left or right side of an identity, you can, Product Identities. The hexagon also shows that a function between any two functions is equal to them multiplied together (if they are opposite each other, then the "1" is between them):.

### List of Trigonometric Identities (Formulas Derivation

Trigonometric Identities. 19/10/2018В В· Free Worksheets Library Download and Print Worksheets from trig identities worksheet pdf , source:comprar-en-internet.net. When you arrive on their page that is primary, all youвЂ™ve got to do is either select one of several templates they give or Start Fresh. https://en.m.wikipedia.org/wiki/List_of_limits List of the Basic Trig Identities. In this lesson, we will learn and memorize the three basic trig identities.These are sometimes referred to as the Pythagorean identities.Sometimes we can be.

1/28/2014 Physics Handout Series.Tank: Basic Trig Trig-2 The trigonometric functions are geometric in nature so geometric arguments are to be used to develop the fundamental identities and to prove that: 0 sin( ) Limit 1 This limit plus a few trigonometric identities are required to the prove that: sin( ) вЂ¦ Trigonometric Identities are formulas that involve Trigonometric functions. These identities are true for all values of the variables. Trigonometric Ratio is known for the relationship between the measurement of the angles and the length of the side of the right triangle. Here we provide the students with a list of all Trigonometry formula

Of course you use trigonometry, commonly called trig, in pre-calculus. And you use trig identities as constants throughout an equation to help you solve problems. The always-true, never-changing trig identities are grouped by subject in the following lists: Trigonometric Identities are formulas that involve Trigonometric functions. These identities are true for all values of the variables. Trigonometric Ratio is known for the relationship between the measurement of the angles and the length of the side of the right triangle. Here we provide the students with a list of all Trigonometry formula

Trigonometric Identities PythagorasвЂ™s theorem sin2 + cos2 = 1 (1) 1 + cot2 = cosec2 (2) tan2 + 1 = sec2 (3) Note that (2) = (1)=sin 2 and (3) = (1)=cos . Compound-angle formulae cos(A+ B) = cosAcosB sinAsinB (4) cos(A B) = cosAcosB+ sinAsinB (5) sin(A+ B) = sinAcosB+ cosAsinB (6) sin(A B) = sinAcosB cosAsinB (7) tan(A+ B) = tanA+ tanB 1 tanAtanB (8) tan(A B) = tanA tanB 1 + tanAtanB (9) cos2 List of trigonometric identities. From Wikipedia, the free encyclopedia. In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every single value of the occurring variables. Geometrically, these are identities involving certain functions of one or more angles. They are distinct from

Alternative pdf link. [Trigonometry] [Differential Equations] [Complex Variables] [Matrix Algebra] S.O.S MATHematics home page Trigonometric Identities In this unit we are going to look at trigonometric identities and how to use them to solve trigonometricequations

Trigonometric Identities In this unit we are going to look at trigonometric identities and how to use them to solve trigonometricequations 19/10/2018В В· Free Worksheets Library Download and Print Worksheets from trig identities worksheet pdf , source:comprar-en-internet.net. When you arrive on their page that is primary, all youвЂ™ve got to do is either select one of several templates they give or Start Fresh.

Table of Trigonometric Identities. Download as PDF file. Reciprocal identities. Pythagorean Identities . Quotient Identities. Co-Function Identities. Even-Odd Identities. Sum-Difference Formulas. Double Angle Formulas. Power-Reducing/Half Angle Formulas. Sum-to-Product Formulas. Product-to-Sum Formulas. Download as PDF file [Trigonometry] [Differential Equations] [Complex Variables] [Matrix Pythagorean IdentitiesPythagorean Identities sin 2x + cos2x = 1 cos2x = 1 вЂ“ sin 2x sin 2x = 1 - cos2x tan 2x вЂ“ sec2x = -1 1 + tan 2x = sec2x 1 + cot2x = csc2x Sum or difference of two angles sin(a + b) = sina cosb + cosa sinb cos(a + b) = cosa cosb - sina sinb sin(a - b) = sina cosb - cosa sinb cos(a - вЂ¦

What trig identities can I create that I have not yet seen? What Polar graphs can I create by messing with trig functions? What makes a pretty graph instead of one that just looks messed up? Can I come up with a simpler method of doing things than I am being taught? Table of Trigonometric Identities. Download as PDF file. Reciprocal identities. Pythagorean Identities . Quotient Identities. Co-Function Identities. Even-Odd Identities. Sum-Difference Formulas. Double Angle Formulas. Power-Reducing/Half Angle Formulas. Sum-to-Product Formulas. Product-to-Sum Formulas. Download as PDF file [Trigonometry] [Differential Equations] [Complex Variables] [Matrix

## List of trigonometric identities USNA

nn) (cx ncx nn). In order to learn about trig identities, students are taught the basic concept of trigonometry. Students can download and print these basic trig identities in the form of PDF. They can use this data at anytime to find solutions to equations. In fact, the subject trigonometry is considered as an important branch of mathematics. From these, trig, Simplify Trig Identities Worksheet PDF, Simplifying Trig Expressions KEY Simplify each expression to a number or one trig function. _____ 1. )(secрќњѓ)cosрќњѓ=(1 cosрќњѓ, simplifying trig identities worksheet pdf, simplify trigonometric identities worksheet, simple trig identities worksheet pdf, using trig identities worksheet, trig identities problems worksheet, simplifying trig.

### Trig Identities All List of Trigonometric Identities

USEFUL TRIGONOMETRIC IDENTITIES. In order to learn about trig identities, students are taught the basic concept of trigonometry. Students can download and print these basic trig identities in the form of PDF. They can use this data at anytime to find solutions to equations. In fact, the subject trigonometry is considered as an important branch of mathematics. From these, trig, Of course you use trigonometry, commonly called trig, in pre-calculus. And you use trig identities as constants throughout an equation to help you solve problems. The always-true, never-changing trig identities are grouped by subject in the following lists:.

List of trigonometric identities. From Wikipedia, the free encyclopedia. In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every single value of the occurring variables. Geometrically, these are identities involving certain functions of one or more angles. They are distinct from In order to learn about trig identities, students are taught the basic concept of trigonometry. Students can download and print these basic trig identities in the form of PDF. They can use this data at anytime to find solutions to equations. In fact, the subject trigonometry is considered as an important branch of mathematics. From these, trig

List of trigonometric identities. From Wikipedia, the free encyclopedia. In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every single value of the occurring variables. Geometrically, these are identities involving certain functions of one or more angles. They are distinct from Hyperbolic Trig Functions в€« sinh cosh udu u c = + в€«sech tanh sech u udu u c в€’+= в€« sech tanh 2 udu u c = + в€« cosh sinh udu u c = + в€«csch coth csch u udu u c в€’+= в€« csch coth 2 udu u c в€’ +=

Basic Identities The functions cos(Оё) and sin(Оё) are deп¬Ѓned to be the x and y coordinates of the point at an angle of Оё on the unit circle. Therefore, sin(в€’Оё) = в€’sin(Оё), cos(в€’Оё) = cos(Оё), and sin2(Оё) + cos2(Оё) = 1. The other trigonometric functions are deп¬Ѓned in terms of sine and cosine: Trigonometric Identities. Trigonometric identities are identities in mathematics that involve trigonometric functions such as sin(x), cos(x) and tan(x). Identities, as opposed to equations, are statements where the left hand side is equivalent to the right hand side.

Trigonometry (trig) identities. All these trig identities can be derived from first principles. But there are a lot of them and some are hard to remember. Print this page as a handy quick reference guide. Recall that these identities work both ways. That is, if you have an expression that matches the left or right side of an identity, you can Trigonometry: Trig identities (Grade 11) reeF High School Science Texts Project This work is produced by OpenStax-CNX and licensed under the Creative Commons Attribution License 3.0 y 1 rigonometricT Identities 1.1 Deriving aluesV of rigonomeT tric unctionsF for 30 , 45 and 60

Basic Identities The functions cos(Оё) and sin(Оё) are deп¬Ѓned to be the x and y coordinates of the point at an angle of Оё on the unit circle. Therefore, sin(в€’Оё) = в€’sin(Оё), cos(в€’Оё) = cos(Оё), and sin2(Оё) + cos2(Оё) = 1. The other trigonometric functions are deп¬Ѓned in terms of sine and cosine: Lecture Notes Trigonometric Identities 1 page 3 Sample Problems - Solutions 1. tanxsinx+cosx = secx Solution: We will only use the fact that sin2 x+cos2 x = 1 for вЂ¦

Trig Identities вЂ“ Trigonometry is an imperative part of mathematics which manages connections or relationship between the lengths and angles of triangles. It is a significant old idea and was first utilized in the third century BC. This part of science is connected with planar right-triangles (or the right-triangles in a two-dimensional plane with one angle equivalent to 90 degrees). Trig-identities. 1. Trig Identities on the six trigonometric ratios: (Note: trig is an abbreviation for trigonometric. We will use trig for the word trigonometric to avoid repetition and therefore boredom.)

Mar 17 - Today we began Proving (Verifying) Trig Identities! You formed small groups and were assigned 6 problems from the list of 31 to form a portfolio. Be sure to follow the directions and ask questions if needed. McKinley and Nathan R., you will work together as Group 11, and will complete #1, 7, 12, 19, 25, and 27. We will work on the Table of Trigonometric Identities Definitions sin a c T cos b c T tan a b T Basic Identities 1 sin csc T T 1 cos sec T T 1 tan cot T T 1 cot tan T T 1 csc sin T T 1 sec cos T T Periodicity sin 2 sinT S T cos 2 cosT S T tan tanT S T Pythagorean Identities sin cos 122TT sec tan 122TT csc cot 122TT Quotient Identities sin tan cos T T T cos cot sin

In order to learn about trig identities, students are taught the basic concept of trigonometry. Students can download and print these basic trig identities in the form of PDF. They can use this data at anytime to find solutions to equations. In fact, the subject trigonometry is considered as an important branch of mathematics. From these, trig Trig Identities вЂ“ Trigonometry is an imperative part of mathematics which manages connections or relationship between the lengths and angles of triangles. It is a significant old idea and was first utilized in the third century BC. This part of science is connected with planar right-triangles (or the right-triangles in a two-dimensional plane with one angle equivalent to 90 degrees).

Trigonometric Identities In this unit we are going to look at trigonometric identities and how to use them to solve trigonometricequations Basic Identities The functions cos(Оё) and sin(Оё) are deп¬Ѓned to be the x and y coordinates of the point at an angle of Оё on the unit circle. Therefore, sin(в€’Оё) = в€’sin(Оё), cos(в€’Оё) = cos(Оё), and sin2(Оё) + cos2(Оё) = 1. The other trigonometric functions are deп¬Ѓned in terms of sine and cosine:

Trigonometric Identities In this unit we are going to look at trigonometric identities and how to use them to solve trigonometricequations Trig-identities. 1. Trig Identities on the six trigonometric ratios: (Note: trig is an abbreviation for trigonometric. We will use trig for the word trigonometric to avoid repetition and therefore boredom.)

Mar 17 - Today we began Proving (Verifying) Trig Identities! You formed small groups and were assigned 6 problems from the list of 31 to form a portfolio. Be sure to follow the directions and ask questions if needed. McKinley and Nathan R., you will work together as Group 11, and will complete #1, 7, 12, 19, 25, and 27. We will work on the mathsgenie.co.uk Write your name here Surname Other Names AS/A Level Mathematics Trig Identities Instructions вЂў Use black ink or ball-point pen. вЂў If pencil is used for вЂ¦

Table of Trigonometric Identities. Download as PDF file. Reciprocal identities. Pythagorean Identities . Quotient Identities. Co-Function Identities. Even-Odd Identities. Sum-Difference Formulas. Double Angle Formulas. Power-Reducing/Half Angle Formulas. Sum-to-Product Formulas. Product-to-Sum Formulas. Download as PDF file [Trigonometry] [Differential Equations] [Complex Variables] [Matrix Trigonometry (trig) identities. All these trig identities can be derived from first principles. But there are a lot of them and some are hard to remember. Print this page as a handy quick reference guide. Recall that these identities work both ways. That is, if you have an expression that matches the left or right side of an identity, you can

Trigonometric Identities are useful whenever trigonometric functions are involved in an expression or an equation. Identity inequalities which are true for every value occurring on both sides of an equation. Geometrically, these identities involving certain functions of one or more angles. Mar 17 - Today we began Proving (Verifying) Trig Identities! You formed small groups and were assigned 6 problems from the list of 31 to form a portfolio. Be sure to follow the directions and ask questions if needed. McKinley and Nathan R., you will work together as Group 11, and will complete #1, 7, 12, 19, 25, and 27. We will work on the

### Trig Identities Table of Trigonometric Identities

Trig Formulae & Equations Higher Mathematics. Trigonometric Functions By Daria Eiteneer Topics Covered: Reminder: relationship between degrees and radians The unit circle Definitions of trigonometric functions for a right triangle Definitions of trigonometric functions for a unit circle Exact values for trigonometric functions of most commonly used angles Trigonometric functions of any angle Оё' in terms of angle Оё in quadrant I, Alternative pdf link. [Trigonometry] [Differential Equations] [Complex Variables] [Matrix Algebra] S.O.S MATHematics home page.

nn) (cx ncx nn). Of course you use trigonometry, commonly called trig, in pre-calculus. And you use trig identities as constants throughout an equation to help you solve problems. The always-true, never-changing trig identities are grouped by subject in the following lists:, What trig identities can I create that I have not yet seen? What Polar graphs can I create by messing with trig functions? What makes a pretty graph instead of one that just looks messed up? Can I come up with a simpler method of doing things than I am being taught?.

### Trig Identities Worksheet Pdf Briefencounters

Magic Hexagon for Trig Identities. Complex logarithm identities. The complex logarithm is the complex number analogue of the logarithm function. No single valued function on the complex plane can satisfy the normal rules for logarithms. However a multivalued function can be defined which satisfies most of the identities. https://en.wikipedia.org/wiki/Proofs_of_trigonometric_identities Using this double angle formula for tan 2A and the two identities: We can replace 2A with x and use T for tan(x/2). This gives us the following identities, which allow all the trigonometric functions of any angle to be expressed in terms of T..

Mar 17 - Today we began Proving (Verifying) Trig Identities! You formed small groups and were assigned 6 problems from the list of 31 to form a portfolio. Be sure to follow the directions and ask questions if needed. McKinley and Nathan R., you will work together as Group 11, and will complete #1, 7, 12, 19, 25, and 27. We will work on the List of the Basic Trig Identities. In this lesson, we will learn and memorize the three basic trig identities.These are sometimes referred to as the Pythagorean identities.Sometimes we can be

Trigonometric Identities Worksheets A Full List of Trig Formulas. The trigonometric identities worksheets consist of a collection of all the frequently used formulas, offering a blend of degrees and radians to practice them. For easy navigation, the exercises are classified based on the identity used, into fundamental trig identities, even-odd functions, periodic identity, sum and difference Trigonometric Identities In this unit we are going to look at trigonometric identities and how to use them to solve trigonometricequations

Trig-identities. 1. Trig Identities on the six trigonometric ratios: (Note: trig is an abbreviation for trigonometric. We will use trig for the word trigonometric to avoid repetition and therefore boredom.) Simplify Trig Identities Worksheet PDF, Simplifying Trig Expressions KEY Simplify each expression to a number or one trig function. _____ 1. )(secрќњѓ)cosрќњѓ=(1 cosрќњѓ, simplifying trig identities worksheet pdf, simplify trigonometric identities worksheet, simple trig identities worksheet pdf, using trig identities worksheet, trig identities problems worksheet, simplifying trig

List of Trig Identities. Trigonometry is a wide branch that has applications in various field such as Mathematics, Physics, Astronomy, etc. Hence many identities or equalities have been derived by the mathematicians over the years from the basic functions. Pythagorean IdentitiesPythagorean Identities sin 2x + cos2x = 1 cos2x = 1 вЂ“ sin 2x sin 2x = 1 - cos2x tan 2x вЂ“ sec2x = -1 1 + tan 2x = sec2x 1 + cot2x = csc2x Sum or difference of two angles sin(a + b) = sina cosb + cosa sinb cos(a + b) = cosa cosb - sina sinb sin(a - b) = sina cosb - cosa sinb cos(a - вЂ¦

Trigonometric Identities. Trigonometric identities are identities in mathematics that involve trigonometric functions such as sin(x), cos(x) and tan(x). Identities, as opposed to equations, are statements where the left hand side is equivalent to the right hand side. 19/10/2018В В· Free Worksheets Library Download and Print Worksheets from trig identities worksheet pdf , source:comprar-en-internet.net. When you arrive on their page that is primary, all youвЂ™ve got to do is either select one of several templates they give or Start Fresh.

Basic Identities The functions cos(Оё) and sin(Оё) are deп¬Ѓned to be the x and y coordinates of the point at an angle of Оё on the unit circle. Therefore, sin(в€’Оё) = в€’sin(Оё), cos(в€’Оё) = cos(Оё), and sin2(Оё) + cos2(Оё) = 1. The other trigonometric functions are deп¬Ѓned in terms of sine and cosine: Trigonometry: Trig identities (Grade 11) reeF High School Science Texts Project This work is produced by OpenStax-CNX and licensed under the Creative Commons Attribution License 3.0 y 1 rigonometricT Identities 1.1 Deriving aluesV of rigonomeT tric unctionsF for 30 , 45 and 60

Trig-identities. 1. Trig Identities on the six trigonometric ratios: (Note: trig is an abbreviation for trigonometric. We will use trig for the word trigonometric to avoid repetition and therefore boredom.) Trigonometric Identities PythagorasвЂ™s theorem sin2 + cos2 = 1 (1) 1 + cot2 = cosec2 (2) tan2 + 1 = sec2 (3) Note that (2) = (1)=sin 2 and (3) = (1)=cos . Compound-angle formulae cos(A+ B) = cosAcosB sinAsinB (4) cos(A B) = cosAcosB+ sinAsinB (5) sin(A+ B) = sinAcosB+ cosAsinB (6) sin(A B) = sinAcosB cosAsinB (7) tan(A+ B) = tanA+ tanB 1 tanAtanB (8) tan(A B) = tanA tanB 1 + tanAtanB (9) cos2