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

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

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