यदि $\frac{x^2}{2 x^4+7 x^2+6}=\frac{A x+B}{x^2+a}+\frac{C x+D}{a x^2+3}$ है, तो $A+B+C-2 D$ का मान ज्ञात कीजिए। ($a$ में)

  • A
    $2$
  • B
    $-2$
  • C
    $-4$
  • D
    $4$

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