differentiation

Question: If $x = a{\rm{ }}\left( {\cos t + \log \tan \frac{t}{2}} \right)\,,y = a\sin t,$then $\frac{{dy}}{{dx}} = $

1) $\tan t$

2) $ - \tan t$

3) $\cot t$

4) $ - \cot t$

Solution:

Explanation: Explanation

Implicit-function

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