$\int \frac{d x}{\sqrt{36-x^{2}}}=$ কত ?

$\sin ^{-1} x+C$

$\sin ^{-1} \frac{x}{6}+C$

$\frac{1}{6} \sin ^{-1} x+C$

$\frac{1}{6} \sin ^{-1\frac{x}{6}}+\mathrm{C}$