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

  • 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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परिमेय फलन का समाकलन कीजिए: $\frac{x}{(x+1)(x+2)}$

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