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Trigonometric identities

Pythagorean Identities Definitions Odd and even functions Periodicity Addition formulas Double angle formulas Half angle formulas Multiple angle formulas Other identities

Pythagorean identities

Identities from definitions

Odd and even functions

Even function:

If a function $f$ satisfies $f(-x)=f(x)$ for every number $x$ in its domain, then $f$ is called an even function.

Odd function:

If $f$ satisfies $f(-x)=-f(x)$ for every number $x$ in its domain, then $f$ is called an odd function.

Pythagorean Identities Definitions Odd and even functions Periodicity Addition formulas Double angle formulas Half angle formulas Multiple angle formulas Other identities Top of file $\triangle $

Periodicity

Period = $2\pi $

Period = $\pi $

Addition formulas

Basic Formulas

Special Cases

Pythagorean Identities Definitions Odd and even functions Periodicity Addition formulas Double angle formulas Half angle formulas Multiple angle formulas Other identities Top of file $\triangle $

Double angle formulas

Half Angle Formulas

Pythagorean Identities Definitions Odd and even functions Periodicity Addition formulas Double angle formulas Half angle formulas Multiple angle formulas Other identities Top of file $\triangle $

Multiple angle formulas

Other identities

Pythagorean Identities Definitions Odd and even functions Periodicity Addition formulas Double angle formulas Half angle formulas Multiple angle formulas Other identities Top of file $\triangle $

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Copyright © 2006 Darel Hardy, Fred Richman, Carol Walker, Robert Wisner. All rights reserved. Except upon the express prior permission in writing, from the authors, no part of this work may be reproduced, transcribed, stored electronically, or transmitted in any form by any method.

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