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

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

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