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\int \frac{d x}{a^{2} + x^{2}}

= f(x)+c হলে, f(x) এর মান কোনটি?

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

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

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

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

ANS : 2

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