If \( \int \frac{2 x^{2}+3}{\left(x^{2}-1\right)\left(x^{2}+4\right...

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If \( \int \frac{2 x^{2}+3}{\left(x^{2}-1\right)\left(x^{2}+4\right)} d x=a \ln \left(\frac{x-1}{x+1}\right)+ \)
\( \mathrm{P}^{699} \)
W \( b \tan ^{-1} \frac{x}{2}+C \), then values of \( a \) and \( b \) are respectively.
(1) \( \frac{1}{2}, \frac{1}{3} \)
(2) 1,1
(3) \( \frac{1}{2}, \frac{1}{2} \)
(4) \( \frac{1}{3}, \frac{1}{3} \)
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