Cos 2A - cos 2 A - 2-3 - cos 2 A - 2-3 -

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Standard Values of Trigonometric Ratios

cos 2A + cos ...

Question

${cos}^{2} A + {cos}^{2} (A + \frac{2 π}{3}) + {cos}^{2} (A - \frac{2 π}{3}) =$

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