$\left\{\frac{d}{d x}\left(\sec x^{\circ}\right)\right\}_{x=30} = $ . . . . . . .

  • A
    $\frac{\pi}{240}$
  • B
    $\frac{\pi}{180}$
  • C
    $\frac{\pi}{270}$
  • D
    $\frac{\pi}{90}$

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