Задача 54966 Хелп...

5f91af2c80c7303e80e6594e

26.10.2020 07:30:58

Хелп

5f3ea7e3faf909182968ddd9

26.10.2020 09:30:52

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α =60 °
β =60 °
γ =?

cos^2 α +cos^2 β +cos^2 γ =1

cos^2 γ =1-cos^2 α -cos^2 β =1-(1/2)^2-(1/2)^2=1/2

cos γ = ± sqrt(2)/2

γ =45 ° или γ =135 °