If \( x=2 \cos t-\cos 2 t, y=2 \sin t-\sin 2 t \), then at W. \( t=...

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If \( x=2 \cos t-\cos 2 t, y=2 \sin t-\sin 2 t \), then at
W. \( t=\frac{\pi}{4}, \frac{d y}{d x}= \)
(A) \( \sqrt{2}+1 \)
(B) \( \sqrt{2+1} \)
(C) \( \frac{\sqrt{2+1}}{2} \)
(D) None of these
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