If $ y = \sin^{n}x \cos{nx} $, then $ \frac{dy}{dx} $ is

Question

$ n \sin^{n-1}x \cos{(n+1)x} $

$ n \sin^{n-1}x \sin{(n+1)x} $

$ n \sin^{n-1}x \cos{(n-1)x} $

$ n \sin^{n-1}x \cos{nx} $

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