Решите: (cos 30 градусов+cos 45 градусов)(cos 45 градусов -sin60градусо)=. Created by yulialol0. geometriya-ru

Ответ:- или -0,25Объяснение:cos30°=cos45°=sin60°=

Решите: (cos 30 градусов+cos 45 градусов)(cos 45 градусов -sin60градусо)=...

yulialol0 @yulialol0

July 2022 1 12 Report

Решите:
(cos 30 градусов+cos 45 градусов)(cos 45 градусов -sin60градусо)=

Answers & Comments

alex080297

Ответ:

- $\frac{1}{4}$ или -0,25

Объяснение:

cos30°= $\frac{\sqrt{3}}{2}$

cos45°= $\frac{\sqrt{2} }{2}$

sin60°= $\frac{\sqrt{3}}{2}$

$\frac{\sqrt{3} }{2} +\frac{\sqrt{2} }{2} )*(\frac{\sqrt{2} }{2} -\frac{\sqrt{3} }{2} )=\frac{\sqrt{6} }{4} +\frac{2}{4}-\frac{3}{4} -\frac{\sqrt{6} }{4} =-\frac{1}{4} =-0.25$

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