# Difference between revisions of "Trigonometric identities"

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+ | == Reciprocal Identities == | ||

+ | |||

+ | == Pythagorean Identities == | ||

*<math>\displaystyle \sin^2x + \cos^2x = 1</math> | *<math>\displaystyle \sin^2x + \cos^2x = 1</math> | ||

*<math>\displaystyle 1 + \cot^2x = \csc^2x</math> | *<math>\displaystyle 1 + \cot^2x = \csc^2x</math> | ||

*<math>\displaystyle \tan^2x + 1 = \sec^2x</math> | *<math>\displaystyle \tan^2x + 1 = \sec^2x</math> | ||

+ | |||

+ | == Double Angle Identities == | ||

+ | |||

+ | == Even-Odd Identities == | ||

+ | |||

+ | == Other Identities == | ||

+ | |||

*<math>|1-e^{i\theta}|=2\sin\frac{\theta}{2}</math> | *<math>|1-e^{i\theta}|=2\sin\frac{\theta}{2}</math> | ||

## Revision as of 23:53, 23 June 2006

Trigonometric identities are used to manipulate trig equations in certain ways. Here is a list of them:

## Contents

## Reciprocal Identities

## Pythagorean Identities

## Double Angle Identities

## Even-Odd Identities

## Other Identities

This page is incomplete--if you know of a trigonometric identity, add it.