If $ y = \sin x \cdot \sin 2x \cdot \sin 3x \cdots \sin nx $, then $ y' $ is...

Question

$\sum_{k=1}^{n} k \tan kx$

$y \cdot \sum_{k=1}^{n} k \cot kx$

$y \cdot \sum_{k=1}^{n} k \tan kx$

$\sum_{k=1}^{n} \cot kx$

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