જો $\int \frac{2 x^{2}+3}{\left(x^{2}-1\right)\left(x^{2}+4\right)} d x=a \log \left|\frac{x-1}{x+1}\right|+b \tan ^{-1}\left(\frac{x}{2}\right)+C$ હોય,તો

  • A
    $a=\frac{1}{2}, \quad b=\frac{1}{2}$
  • B
    $a=-1, \quad b=1$
  • C
    $a=\frac{1}{2}, \quad b=-\frac{1}{2}$
  • D
    $a=1, \quad b=-1$

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જો $\int \frac{x}{\left(x^2+1\right)(x-1)} d x=A \log \left|x^2+1\right|+B \tan ^{-1} x+C \log |x-1|+d$ હોય, તો $A+B+C=$

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