यदि $\frac{x^4+x^3+2x^2-2x+1}{x^3+x^2} = P(x) + \frac{A}{x} + \frac{B}{x^2} + \frac{C}{x+1}$ है,तो $A+B+C = $

  • A
    $0$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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$\frac{x^2-1}{(x^2+1)(x^2+2)}$ के घात श्रेणी विस्तार में $x^4$ का गुणांक है

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