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Prove that sin^2 A + cos^2​​​​​​​ A = 1.

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Prove that sin2 A + cos2 A = 1.

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Best answer

sin2 A + cos2 A = 1

Proof:

Again a2 + c2 = b2 ( by Pythagoras Theorem)  .......(i)

Dividng eq (i) by a2

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