If \( y=\cos \left(\sin x^{2}\right) \), then at \( x=\sqrt{\frac{\...

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If \( y=\cos \left(\sin x^{2}\right) \), then at \( x=\sqrt{\frac{\pi}{2}}, \frac{d y}{d x}= \)
\( \mathrm{P} \)
(A) -2
(B) 2
(C) \( -2 \sqrt{\frac{\pi}{2}} \)
(D) 0
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