\[ \int \frac{d x}{\left(9+x^{2}\right)}=? \] P W (a) \( \tan ^{-1}...

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\[
\int \frac{d x}{\left(9+x^{2}\right)}=?
\]
P
W
(a) \( \tan ^{-1} \frac{x}{3}+C \)
(b) \( \frac{1}{3} \tan ^{-1} \frac{x}{3}+C \)
(c) \( 3 \tan ^{-1} \frac{x}{3}+C \)
(d) none of these
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