यदि $\frac{1}{x^4+1}=\frac{A x+B}{x^2+\sqrt{2} x+1}+\frac{C x+D}{x^2-\sqrt{2} x+1}$ है,तो $B D-A C=$

  • A
    $\frac{3}{8}$
  • B
    $\frac{1}{8}$
  • C
    $1$
  • D
    $0$

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