If $\frac{5x^2+2}{x^3+x}=\frac{A_1}{x}+\frac{A_2x+A_3}{x^2+1}$,then $(A_1, A_2, A_3) = $

  • A
    $(0, 2, 3)$
  • B
    $(3, 0, 2)$
  • C
    $(2, 3, 0)$
  • D
    $(2, 0, 3)$

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