If \( y=\cos ^{2} x^{3} \) then \( \frac{d y}{d x}=? \) \( \mathrm{...

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If \( y=\cos ^{2} x^{3} \) then \( \frac{d y}{d x}=? \)
\( \mathrm{P} \)
(a) \( -3 x^{2} \sin \left(2 x^{3}\right) \)
(b) \( -3 x^{2} \sin ^{2} x^{3} \)
(c) \( -3 x^{2} \cos ^{2}\left(2 x^{3}\right) \) (d) none of these
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