Solve this following

Question:

If $x=(2 \cos \theta-\cos 2 \theta)$ and $=(2 \sin \theta-\sin 2 \theta)$, find $\left(\frac{\mathrm{d}^{2} \mathrm{y}}{\mathrm{dx}^{2}}\right)_{\theta=\frac{\pi}{2}} .$

Solution:

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