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Question Number 143897 by liberty last updated on 19/Jun/21

Answered by bobhans last updated on 19/Jun/21

$$\sin {}^2\frac{\pi }{8}+\cos {}^2\frac{\pi }{8}+\cos {}^2\frac{5\pi }{8}+\sin {}^2\frac{5\pi }{8}=2$$

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