World Web Math: Useful Trigonometric Identites
Useful Trigonometric Identities
This page is meant to be used as reference listing of useful
trigonometric identities. No discussion of the proofs or the
consequences of these identities will be give here.

Addition Formulas

Subtraction formulas

Double Angle Formulas

Half-Angle Formulas

Product Formulas

Factoring Formulas

The following two formulas are of only limited use:

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Last modified August 1, 1998