ધારો કે $f(x) = \int \frac{2x}{(x^2+1)(x^2+3)} dx$. જો $f(3) = \frac{1}{2}(\log_e 5 - \log_e 6)$ હોય,તો $f(4)$ ની કિંમત શોધો.

  • A
    $\frac{1}{2}(\log_e 17 - \log_e 19)$
  • B
    $\log_e 17 - \log_e 18$
  • C
    $\frac{1}{2}(\log_e 19 - \log_e 17)$
  • D
    $\log_e 19 - \log_e 20$

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જો $\int \frac{2 x^2-3}{\left(x^2-4\right)\left(x^2+1\right)} d x=A \tan^{-1} x+B \log (x-2)+C \log (x+2)$ હોય,તો $6 A+7 B-5 C=$

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