यदि $f\left(\frac{t+1}{2 t+1}\right)=t+1$ है, तो $\int f(x) d x=$

  • A
    $\frac{x^2}{2}+c$
  • B
    $\log (2 x-1)+\frac{1}{2} \log (x+1)+c$
  • C
    $\frac{1}{2} \log (2 x-1)+c$
  • D
    $\frac{x}{2}+\frac{1}{4} \log (2 x-1)+c$

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