$\tan 100^\circ + \tan 125^\circ + \tan 100^\circ \tan 125^\circ = $

  • A
    $0$
  • B
    $1/2$
  • C
    $-1$
  • D
    $1$

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$\cos 1^\circ + \cos 2^\circ + \cos 3^\circ + \dots + \cos 180^\circ = $

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