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

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

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