Mark against the correct answer in each of the following:

Question:

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

$\int \frac{d x}{x \sqrt{x^{6}-1}}=?$

A. $\frac{1}{3} \sec ^{-1} x^{3}+C$

B. $\frac{1}{3} \operatorname{cosec}^{-1} \mathrm{x}^{3}+\mathrm{C}$

C. $\frac{1}{3} \cot ^{-1} \mathrm{x}^{3}+\mathrm{C}$

D. none of these

Solution:

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