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Proving trigonometry identities.

Prove this identity.

(cot^2 X) - (cos^2 X) = (cot^2 X)(cos^2 X)

Solution Preview

Cot ^ 2 x = (Cos^2X/ Sin^2 X)
<br>So Cot^2 X - Cos^2 X = (Cos^2X/ Sin ^2X)- Cos^2 X
<br> ...

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