$\mathrm {\sin ^{-1} 2 x}$ এর অন্তরজ কত?

$\mathrm {\dfrac{2}{\sqrt{1-4 x^{2}}}}$

$\mathrm {\dfrac{1}{\sqrt{1-4 x^{2}}}}$

$\mathrm {\dfrac{-2}{\sqrt{1-4 x^{2}}}}$

$\mathrm {\dfrac{1}{2\sqrt{1-4 x^{2}}}}$