pt cos3A+cos3(120+A)+cos3(240+A)=3/4cos3A

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{cos}^{3} θ + {cos}^{3} (120^{\circ} + θ) + c o s^{3} (120^{\circ} - θ) =

{c o s}^{3} x + {c o s}^{3} (120^{\circ} + x) + {c o s}^{3} (120^{\circ} - x)

{cos}^{3} θ + {cos}^{3} (120^{\circ} + θ) + {cos}^{3} (220^{\circ} + θ) = \frac{3}{4} cos 3 θ

cos A . cos (60 + A) . cos (60 - A) = \frac{1}{4} cos 3 A

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