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# Pythagorean Identities

## Sine squared plus cosine squared equals one.

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## Pythagorean Identities

Defining trigonometric identities that rely on the Pythagorean Theorem

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• PLIX

## Pythagorean Identities: Unit Circle Cosine

Pythagorean Identities Interactive

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• Video

## The Reciprocal, Quotient, and Pythagorean Identities

Determines values of trigonometric functions by using reciprocal, quotient, and Pythagorean identities.

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• Practice
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