If \( f(x)=\sqrt{1+\cos ^{2}\left(x^{2}\right)} \), then \( f^{\pri...

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If \( f(x)=\sqrt{1+\cos ^{2}\left(x^{2}\right)} \), then \( f^{\prime}\left(\frac{\sqrt{\pi}}{2}\right) \)
P
(a) \( \sqrt{\pi} / 6 \)
(b) \( -\sqrt{\pi / 6} \)
(c) \( 1 / \sqrt{6} \)
(d) \( \pi / \sqrt{6} \)
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