Mark against the correct answer in each of the following:

Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

$\int \frac{1}{x \sqrt{x^{4}-1}} d x=?$

A. $\sec ^{-1} x^{2}+C$

B. $\frac{1}{2} \sec ^{-1} x^{2}+C$

C. $\operatorname{cosec}^{-1} x^{2}+C$

D. none of these

Solution:

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