9.27 Pythagorean identities

Pythagorean identities

Pythagorean identities are formulas, derived from Pythagorean Theorem, that allow us to find out where a point is on the unit circle. Learn the tricks and tips on how to use the unit circle to derive and prove the Pythagorean identities can be difficult.

Lessons

Notes:
Download the Trigonometry identities chart here

  • 2.
    Simplify expressions:

  • 3.
    Prove identities
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Pythagorean identities

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