Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
If $y=\cos ^{2} x^{3}$ then $\frac{d y}{d x}=$ ?
A. $-3 x^{2} \sin$
B. $-3 x^{2} \sin ^{2} x^{3}$
C. $-3 x^{2} \cos ^{2}\left(2 x^{3}\right)$
D. none of these
Solution:
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