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\int \frac{d x}{\sqrt{16 - 9 x^{2}}} = ?

\sin^{- 1} \frac{3 x}{4} + k

\cos^{- 1} \frac{3 x}{4} + k

\frac{1}{2} \sin^{- 1} \frac{3 x}{4} + k

\frac{3}{4} \sin^{- 1} \frac{3 x}{4} + k

ANS : 3

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