Question

cot A-cosec A)2 =1-cos a/1+cos a

Answer 1

$\frac{ \cot(a) - cosec(a)}{ 2} = \frac{1 - \cos(a) }{1 + \cos(a) } \\ = \frac{ \frac{ \cos(a) }{ \sin(a) } - \frac{1}{ \sin(a) } }{2} =$
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Answer 2

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