यदि $\frac{ax - 1}{(1 - x + x^2)(2 + x)} = \frac{x}{1 - x + x^2} - \frac{1}{2 + x}$ है,तो $a = $

  • A
    $2$
  • B
    $3$
  • C
    $4$
  • D
    $5$

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व्यंजक $\frac{x^2 + 1}{(x^2 + 4)(x - 2)}$ के प्रसार में $x^5$ का गुणांक क्या होगा?

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