$1 + \cos 56^\circ + \cos 58^\circ - \cos 66^\circ = $

  • A
    $2 \cos 28^\circ \cos 29^\circ \cos 33^\circ $
  • B
    $4 \cos 28^\circ \cos 29^\circ \cos 33^\circ $
  • C
    $4 \cos 28^\circ \cos 29^\circ \sin 33^\circ $
  • D
    $2 \cos 28^\circ \cos 29^\circ \sin 33^\circ $

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