(cot^2x+1)(sin^2x-1) = -cot^2x
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(cot^2x+1)(sin^2x-1) = -cot^2x

[From: ] [author: ] [Date: 12-11-12] [Hit: ]
......
I'm having trouble proving this. Any help is appreciated.

-
1 + cot^2(x) = csc^2(x)
sin^2(x) - 1 = -(1-sin^2(x)) = -cos^2(x)

csc^2(x) * -cos^2(x) = -cos^2(x)/sin^2(x) = -cot^2(x)
1
keywords: sin,cot,(cot^2x+1)(sin^2x-1) = -cot^2x
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