differentiation

Question: If $x = 2\cos t - \cos 2t$,$y = 2\sin t - \sin 2t$, then at $t = \frac{\pi }{4},\frac{{dy}}{{dx}} = $



1) $\sqrt 2 + 1$
2) $\sqrt {2 + 1} $
3) $\frac{{\sqrt {2 + 1} }}{2}$
4) None of these
Solution: Explanation: Explanation
Implicit-function

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