Вычислите cos(38π/3).
Выберите один ответ:
√2/2
√3/2
-1/2
-√3/2

cos(38π/3)=cos(36π/3+2π/3)=cos(12π+2π/3)==cos(6.2π+2π/3)=cos(2π/3)=-cos(π/3)=-1/2Otvet: -1/2(cos(α+2π)=cosα)