$\begin{aligned} & \frac{x^2+1}{x^4+4}=\frac{A x+B}{x^2-2 x+2}+\frac{C x+D}{x^2+2 x+2} \\ & \Rightarrow 3 A+2 B+3 C=\end{aligned}$

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

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