$\frac{d}{dx} [3 \sin(60^{\circ} - x^{\circ}) - 4 \cos^3(30^{\circ} + x^{\circ})] = \rule{1cm}{0.15mm}$

  • A
    $\frac{\pi}{60} \sin(3x^{\circ})$
  • B
    $\frac{\pi}{60} \sin(3x^{\circ})$
  • C
    $\frac{\pi}{60} \cos(3x^{\circ})$
  • D
    $-\frac{\pi}{60} \cos(3x^{\circ})$

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