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Mathematics
Mathematics
Problem
Find the value of
cos
2
π
16
+
cos
2
3
π
16
+
cos
2
5
π
16
+
cos
2
7
π
16
\cos^2 \frac{\pi}{16} + \cos^2 \frac{3\pi}{16} + \cos^2 \frac{5\pi}{16} + \cos^2 \frac{7\pi}{16}
cos
2
16
π
+
cos
2
16
3
π
+
cos
2
16
5
π
+
cos
2
16
7
π
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