Solve this following


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

$\int \sqrt{1-9 x^{2}} d x=?$

A. $\frac{x}{2} \sqrt{1-9 x^{2}}+\frac{1}{18} \sin ^{-1} 3 x+C$

B. $\frac{3 x}{2} \sqrt{1-9 x^{2}}+\frac{1}{6} \sin ^{-1} 3 x+C$

C. $\frac{x}{2} \sqrt{1-9 x^{2}}+\frac{1}{6} \sin ^{-1} 3 x+C$

D. none of these


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