Вычислите cos70°cos40°+sin70°sin40°

Question

Вычислите
cos70°cos40°+sin70°sin40°

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Liliana 1 год 2021-09-18T09:47:52+00:00 1 Answers 0 views 0

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  1. Isabelle
    0
    2021-09-18T09:49:11+00:00
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    \cos{70^o}\cos{40^o}+\sin{70^o}\cdot\sin{40^o}=\cos{(70^o-40^o)}=\cos{30^o}=\frac{\sqrt{3}}{2}

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