smacias47 smacias47

22-03-2017
Mathematics

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

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ghanami ghanami

22-03-2017

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(θ)

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