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Tigonometric identities are equations involving trigonometric functions that are true for all values of the occurring variables. These identities are useful whenever expressions involving trigonometric functions need to be simplified. An important application is the integration of non-trigonometric functions: a common trick involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity.
Trigonometric Identities - Videos:
Proving Trigonometric Identities - Presentation:
Verifying trigonometric identities - Presentation: