यदि $\frac{d}{dx} \left( \frac{x^4 + x^2 + 1}{x^2 + x + 1} \right) = ax + b$ है,तो $a - b =$ क्या होगा?

  • A
    $3$
  • B
    $4$
  • C
    $1$
  • D
    $2$

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