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

  • A
    $a$
  • B
    $2a$
  • C
    $3a$
  • D
    $4a$

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