differentiation

Question: If $x = a(t - \sin t)$and $y = a(1 - \cos t),$then $\frac{{dy}}{{dx}} = $



1) $\tan \left( {\frac{t}{2}} \right)$
2) $ - \tan \left( {\frac{t}{2}} \right)$
3) $\cot \left( {\frac{t}{2}} \right)$
4) $ - \cot \left( {\frac{t}{2}} \right)$
Solution: Explanation: Explanation
Implicit-function

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