\cos ^{2} \theta+\cos ^{2}\left(\frac{2 \pi}{3}+\theta\right)+\cos ^{2 – InterviewSolution

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1.	\cos ^{2} \theta+\cos ^{2}\left(\frac{2 \pi}{3}+\theta\right)+\cos ^{2}\left(\frac{2 \pi}{3}-\theta\right)=\frac{3}{2}
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