\[ \int \frac{d x}{\left(1-9 x^{2}\right)}=? \] \( \mathrm{P} \) (a...
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\[
\int \frac{d x}{\left(1-9 x^{2}\right)}=?
\]
\( \mathrm{P} \)
(a) \( \frac{1}{3} \log \left|\frac{1+3 x}{1-3 x}\right|+C \)
(b) \( \frac{1}{3} \log \left|\frac{1-3 x}{1+3 x}\right|+C \)
(c) \( \frac{1}{6} \log \left|\frac{1+3 x}{1-3 x}\right|+C \)
(d) \( \frac{1}{6} \log \left|\frac{1-3 x}{1+3 x}\right|+C \)
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