Answers

2014-08-06T15:44:52+08:00
1 - cos x / (sin^2 (x)) = - csc x (cot x) + csc^2 (x) = - (1/sinx)(cos x/sin x) + (1/sin^2 x) = - (cos x/sin^2 x) + (1/sin^2 x) = (1 - cos x) / (sin^2 x)
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