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The value of $$\cos^{2}\frac{\pi}{8} + \cos^{2}\frac{3\pi}{8} + \cos^{2}\frac{5\pi}{8} + \cos^{2}\frac{7\pi}{8} + $$ is
1
$$\frac{3}{2}$$
2
$$\frac{9}{4}$$
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