यदि $\int \frac{3-x^2}{1-2 x+x^2} e^x d x=e^x f(x)+c$ है, तो $f(x)$ क्या है?

  • A
    $\frac{1+x}{1-x}$
  • B
    $\frac{1-x}{1+x}$
  • C
    $\frac{1+x}{x-1}$
  • D
    $\frac{x-1}{1+x}$

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