यदि $\int e^{\alpha x}\left(\frac{1-\beta \sin x}{1-\cos x}\right) d x=-e^x \cot \frac{x}{2}+c$ है, तो $\frac{\alpha^2+\beta^2}{2 \alpha \beta}=$

  • A
    -$1$
  • B
    $1$
  • C
    $2$
  • D
    -$2$

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