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$\int \frac{1}{9 + x^{2}} d x$ এর মান কত?

\frac{1}{3} \tan^{- 1} \frac{x}{3} + c

\frac{- 1}{3} \tan \frac{x}{3} + c

\frac{1}{3} \tan^{- 1} \frac{3}{x} + c

\frac{1}{3} \tan^{- 1} \frac{x}{3} + c

ANS : 1

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