\cos ^{2} \frac{\pi}{16}+\cos ^{2} \frac{3 \pi}{16}+\cos ^{2} \frac{5 – InterviewSolution

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1.	\cos ^{2} \frac{\pi}{16}+\cos ^{2} \frac{3 \pi}{16}+\cos ^{2} \frac{5 \pi}{16}+\cos ^{2} \frac{7 \pi}{16}
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