If \( \mathrm{f}(\mathrm{x})=\sqrt{1+\cos ^{2}\left(\mathrm{x}^{2}\...
If \( \mathrm{f}(\mathrm{x})=\sqrt{1+\cos ^{2}\left(\mathrm{x}^{2}\right)} \), then \( \mathrm{f}^{\prime}\left(\frac{\sqrt{\pi}}{2}\right) \) is
\( \mathrm{P} \)
(1) \( \sqrt{\pi} / 6 \)
(2) \( -\sqrt{\pi} / 6 \)
W
(3) \( 1 / \sqrt{6} \)
(4) \( \pi / \sqrt{6} \)
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