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

  • A
    $1$
  • B
    $2$
  • C
    $\frac{3}{4}$
  • D
    $\frac{1}{2}$

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