Срочно, Тригонометрия, 10 кд. Created by anbasova44. algebra-ru

Срочно, Тригонометрия, 10 кд...

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Срочно, Тригонометрия, 10 кд

7x8

$cos^2 \frac{\pi}{8}+sin \frac{\pi}{8} \cdot cos \frac{3\pi}{8} =$

$cos^2 \frac{\pi}{8}+sin \frac{\pi}{8} \cdot cos\left( \frac{\pi}{2}- \frac{\pi}{8} \right) =$

$cos^2 \frac{\pi}{8}+sin \frac{\pi}{8} \cdot sin \frac{\pi}{8} \right) =$

$cos^2 \frac{\pi}{8}+sin^2 \frac{\pi}{8}=1$

Ответ: 1

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