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$\int \frac{d x}{\sqrt{25 - 4 x^{2}}}$ = কত?

\frac{1}{2} \sin^{- 1} \frac{2 x}{5} + k

\frac{5}{2} \sin^{- 1} \frac{2 x}{5} + k

\frac{1}{2} \cos^{- 1} \frac{2 x}{5} + k

\sin^{- 1} \frac{2 x}{5} + k

ANS : 1

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