$|x| < 1$ के लिए $\frac{1}{x^2-5x+6}$ के विस्तार में $x^n$ का गुणांक क्या है?

  • A
    $\frac{1}{2^{n-1}}-\frac{1}{3^{n-1}}$
  • B
    $\frac{1}{2^{n+2}}-\frac{1}{3^{n+2}}$
  • C
    $\frac{1}{2^{n+1}}-\frac{1}{3^{n+1}}$
  • D
    $\frac{1}{2^n}-\frac{1}{3^n}$

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यदि $\frac{x+1}{\left(x^2+1\right)(x-1)^2}=\frac{A x+B}{x^2+1}+\frac{C}{x-1}+\frac{D}{(x-1)^2}$ है, तो $A+B+C+D=$

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