$\int \frac{d x}{\sqrt{36-16 x^{2}}}=$ কত ?

$-\frac{1}{4} \sin ^{-1} \frac{4 x}{6}+c$

$-\sin ^{-1} \frac{4 x}{6}$

$\sin ^{-1} \frac{4 x}{6}+c$

$\frac{1}{4} \sin ^{-1} \frac{4 x}{6}+c$