मान लीजिए $f(x) = \int \frac{2x}{(x^2+1)(x^2+3)} dx$. यदि $f(3) = \frac{1}{2}(\log_e 5 - \log_e 6)$ है,तो $f(4)$ का मान ज्ञात कीजिए।

  • 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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यदि $\int \frac{9x+15}{x^3-6x-9} dx = A \log |g(x)| + B \log |f(x)| + C$ है, तो $\frac{(A-B) g(4)}{f(-1)} =$

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