यदि $a f(x)+b f\left(\frac{1}{x}\right)=x+1$, और $\frac{d}{d x}\left(x^2 f(x)\right)=2 x^2+2 x+\frac{1}{3}$ है, तो $a-b=$

  • A
    $2$
  • B
    $3$
  • C
    $0$
  • D
    $1$

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