If \( x=2 \sin \theta-\sin 2 \theta \) and \( y=2 \cos \theta-\cos ...

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If \( x=2 \sin \theta-\sin 2 \theta \) and \( y=2 \cos \theta-\cos 2 \theta \),
P
W \( \theta \in[0,2 \pi] \), then \( \frac{d^{2} y}{d x^{2}} \) at \( \theta=\pi \) is:
(A) \( \frac{3}{8} \)
(B) \( \frac{3}{2} \)
(C) \( \frac{3}{4} \)
(D) \( -\frac{3}{4} \)
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