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A simple proof of the very important and useful trigonometry Identity sin²(x) + cos²(x) = 1 is shown. Also the notation for squaring trigonometric functions is shown. Since the proof requires the use of the Pythagorean theorem, this identity is called the Pythagorean trigonometric identity.

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Trigonometry Identity: Proof that sin^2(x) + cos^2(x) = 1

Proof