Предмет: Геометрия, автор: RomaNikulin

Нужна помощь: Найдите 5cos2 alpha , если cos alpha  = -0.5

Ответы

Автор ответа: спасигосподи
0
5cos2a=5(2*cos^2a-1)=5(2*(-0.5)^2-1)=5(0.5-1)=-2.5
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