3 years ago

Prove the identity. sin(−θ) cot(−θ) = cos θ

1 answer:

4 0

Hello :
sin(−θ) = - sin(θ)
cot(−θ) = - cot(θ)
cot(θ) = cos(θ)/sin(θ)
sin(−θ) cot(-θ) = (- sin(θ))×(-cos(θ)/sin(θ)) = cos(<span>θ)</span>

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