If \( x=2 \cos t-\cos 2 t \) and \( y=2 \sin t-\sin 2 t \), find \( \frac{d y}{d x} \) at \( t=\...

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If \( x=2 \cos t-\cos 2 t \) and \( y=2 \sin t-\sin 2 t \), find \( \frac{d y}{d x} \) at \( t=\frac{\pi}{4} \).
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