Find \( \frac{d y}{d x} \) in the questions when: \[ x=a(\cos \theta+\cos 2 \theta), y=b(\sin \t...

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Find \( \frac{d y}{d x} \) in the questions when:
\[
x=a(\cos \theta+\cos 2 \theta), y=b(\sin \theta+\sin 2 \theta)
\]
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