$\frac{d}{dx}\left[ \frac{2}{\pi }\sin {x^\circ} \right] = $

  • A
    $\frac{\pi }{180}\cos {x^\circ}$
  • B
    $\frac{1}{90}\cos {x^\circ}$
  • C
    $\frac{\pi }{90}\cos {x^\circ}$
  • D
    $\frac{2}{90}\cos {x^\circ}$

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