$\int \frac{e^x}{(2+e^x)(e^x+1)} dx =$ (जहाँ $C$ एक समाकलन स्थिरांक है।)

  • A
    $\frac{e^x+1}{e^x+2}+C$
  • B
    $\log \left(\frac{e^x+2}{e^x+1}\right)+C$
  • C
    $\log \left(\frac{e^x+1}{e^x+2}\right)+C$
  • D
    $\log \left(\frac{e^x}{e^x+2}\right)+C$

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$\int \frac{dx}{(x^2+1)(x^2+4)} = $

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