Mark against the correct answer in each of the following:
Question:

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

$\int x \sqrt{x^{2}-x} d x=?$

A. $\frac{1}{3}\left(x^{2}-1\right)^{3 / 2}+C$

B. $\frac{2}{3}\left(x^{2}-1\right)^{3 / 2}+C$

C. $\frac{1}{\sqrt{\mathrm{x}^{2}-1}}+\mathrm{C}$

D. none of these

Solution:

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