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\int \frac{d x}{\sqrt{(a 2 - x 2)}} = ?

\frac{1}{x} \sin^{- 1} \frac{x}{a}

\frac{1}{a} \sin^{- 1} \frac{x}{a}

\frac{1}{x} \sin^{- 1} \frac{a}{x}

\frac{1}{a} \sin^{- 1} \frac{a}{x}

ANS : 1

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