Here, $y = \cos 3\theta$ and $x = \sin 2\theta$.
The derivative of $y$ with respect to $\theta$ is given by the chain rule as $dy/d\theta = -\sin 3\theta \cdot 3 = -3\sin 3\theta$.
Similarly, the derivative of $x$ with respect to $\theta$ is $dx/d\theta = \cos
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