Question

Prove that (Cos^2 - 1) (cot^2 + 1) = -1

Answer 1

Answer:

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Answer 2

Answer:

Simply apply the identies,i.e.,

cos^2Φ - 1 = -sin^2Φ

and cot^2Φ = cos^2Φ / sin^2Φ

and you will get the answer.