Question

pls solve the below equation
*csc is cosec*
$\cot(a) - \csc(a) + 1 \div \cot(a) + \csc(a) - 1$
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Answer 1

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$\frac{cota - coseca + 1}{cota + coseca - 1} \\ = \frac{cota - coseca + cosec ^{2} a - {cot}^{2}a }{cota + coseca - 1} \\ = \frac{(coseca - cota)( - 1 + cota + coseca)}{cota + coseca - 1} \\ = coseca - cota \\ = \frac{1 - cosa}{sina}$