вычислите значение выражения:
[tex] { \cos }^{2} ( \frac{\pi}{8} ) + \sin( \frac{\pi}{8} ) \cos( \frac{3\pi}{8} ) [/tex]
[tex] { \cos }^{2} ( \frac{\pi}{8} ) + \sin( \frac{\pi}{8} ) \cos( \frac{3\pi}{8} ) [/tex]
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