$\cos A + \cos (240^\circ + A) + \cos (240^\circ - A) = $

  • A
    $\cos A$
  • B
    $0$
  • C
    $\sqrt{3} \sin A$
  • D
    $\sqrt{3} \cos A$

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$\cos^2 A(3 - 4\cos^2 A)^2 + \sin^2 A(3 - 4\sin^2 A)^2 = $

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