Question

prove that sin2thetha+cos2thetha=1

Answer 1

$= > l.h.s. = sin {}^{2} \alpha + cos {}^{2} \alpha \\ \\ = 1 - cos {}^{2} \alpha + cos {}^{2} \alpha \\ \\ = 1$

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Answer 2

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$\sin(x {}^{2} ) + \cos( {x}^{2} ) = 1$

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