Prove that sin^2θ + cos^2θ = 1 by Pythagorean identities

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How to prove the Trigonometry identities ?
Solve sin(square)theta + cos(square)theta = 1

It is the first and simple identity of trigonometry chapter.
It is basic and most important for the trigonometry in class-9,10.

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  2. Proved by Pythagorean theorem of Trigonometry
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