Question

$\cos(a) \div 1 - \tan(a) + \sin(a) \div 1 - \cot(a) = \sin(a) + \cos(a)$
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Answer 1

$\frac{ \cos(a) }{1 - \tan(a) } + \frac{ \sin(a) }{1 - \cot(a) } \\ = \sin(a) + \cos(a)$

your answer is in the given attachment

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