If x = 3 tan t and y = 3 sec t, then the value of \(\frac{{{d}^{2}}y}{d{{x}^{2}}}\text{ }\!\!~\!\!\text{ at }\!\!~\!\!\text{ }t=\frac{\pi }{4},\) is:

If x = 3 tan t and y = 3 sec t, then the value of \(\frac{{{d}^{2}}y}

1.	If x = 3 tan t and y = 3 sec t, then the value of \(\frac{{{d}^{2}}y}{d{{x}^{2}}}\text{ }\!\!~\!\!\text{ at }\!\!~\!\!\text{ }t=\frac{\pi }{4},\) is:
A.	\(\frac{1}{3\sqrt{2}}\)
B.	\(\frac{1}{6\sqrt{2}}\)
C.	\(\frac{3}{2\sqrt{2}}\)
D.	186
Answer» C. \(\frac{3}{2\sqrt{2}}\)

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If x = 3 tan t and y = 3 sec t, then the value of \(\frac{{{d}^{2}}y}{d{{x}^{2}}}\text{ }\!\!~\!\!\text{ at }\!\!~\!\!\text{ }t=\frac{\pi }{4},\) is:

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