If $x = \sin t$ and $y = \sin pt$,then the value of $(1 - x^2) \frac{d^2y}{dx^2} - x \frac{dy}{dx} + p^2y$ is equal to

  • A
    $0$
  • B
    $1$
  • C
    $-1$
  • D
    $\sqrt{2}$

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