Question

Sin2theta +cos2theta=1 prove
.

Answer 1

In a right angled triangle,

P² + B² = H²

sinФ = P/H

cosФ = B/H

sin²Ф + cos²Ф = P²/H² + B²/H² = (P²+B²)/H² = H²/H² =1

Hence proved

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