\( \int \frac{2 x^{2}+3}{\left(x^{2}-1\right)\left(x^{2}+4\right)} d x=a \log \left(\frac{x+1}{x...
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0\( \int \frac{2 x^{2}+3}{\left(x^{2}-1\right)\left(x^{2}+4\right)} d x=a \log \left(\frac{x+1}{x-1}\right)+b \tan ^{-1} \frac{x}{2} \), then \( a+b= \)
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