If $y = x \sin x$ and $\frac{\frac{dy}{dx} - \frac{y}{x}}{x \frac{dy}{dx} - y}$ at $x = \alpha$ is $1$, then $\alpha =$

  • A
    $\sqrt{2}$
  • B
    $2$
  • C
    $1$
  • D
    $\frac{1}{\sqrt{2}}$

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