Trig
posted by Blossom .
Prove: (cotx sinx)(secxcosx)=sin^2(X)

(cosx/sinx X sinx)(1/cosx  cosx) = sin^2x
(cosx)(1cos^2x) /cosx = sin^2x
1cos^2x = sin^2x
sin^2x = sin^2x
PROVED
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