Derivative of \[{{\sec }^{-1}}\left\{ \frac{1}{2{{x}^{2}}-1} \right\}\]w.r.t \[\sqrt{1+3x}\]at \[x=-\frac{1}{3}\] is [EAMCET 1991]

Derivative of \[{{\sec }^{-1}}\left\{ \frac{1}{2{{x}^{2}}-1} \right\}\

1.	Derivative of \[{{\sec }^{-1}}\left\{ \frac{1}{2{{x}^{2}}-1} \right\}\]w.r.t \[\sqrt{1+3x}\]at \[x=-\frac{1}{3}\] is [EAMCET 1991]
A.	0
B.	1/2
C.	1/3
D.	None of these
Answer» B. 1/2

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Derivative of \[{{\sec }^{-1}}\left\{ \frac{1}{2{{x}^{2}}-1} \right\}\]w.r.t \[\sqrt{1+3x}\]at \[x=-\frac{1}{3}\] is [EAMCET 1991]

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