मान ज्ञात कीजिए: $\frac{d}{d x}\left(3 \cos \left(\frac{\pi}{6}+x^{\circ}\right)-4 \cos ^3\left(\frac{\pi}{6}+x^{\circ}\right)\right) = $ . . . . . .

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

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