यदि $\frac{x^2-7 x+2}{x^4+3 x^2+4}=\frac{A x+B}{x^2+a x+2}+\frac{C x+D}{x^2+b x+2}$ और $a>b$ है,तो $B+D=$

  • A
    $a+b$
  • B
    $2 a+b$
  • C
    $a+2 b$
  • D
    $a-b$

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