यदि $\frac{d}{d x}\left(\frac{2 x+1}{(x+1)^2(x-2)}\right)=\frac{A}{(x-2)^2}+\frac{B}{(x+1)^3}+\frac{C}{(x+1)^2}$ है,तो $A+B+C=$

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

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यदि $\frac{(x - a)(x - b)}{(x - c)(x - d)} = \frac{A}{x - c} - \frac{B}{x - d} + C$ है,तो $C =$

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