If \( x=3 \tan t \) and \( y=3 \sec t \), then the value of \( \fra...

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If \( x=3 \tan t \) and \( y=3 \sec t \), then the value of \( \frac{d^{2} y}{d x^{2}} \) at \( t=\frac{\pi}{4} \), is
(2019 Main, 9 Jan II)
\( \mathrm{P} \)
(a) \( \frac{1}{6} \)
(b) \( \frac{1}{6 \sqrt{2}} \)
(c) \( \frac{1}{3 \sqrt{2}} \)
(d) \( \frac{3}{2 \sqrt{2}} \)
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