Ответ:-4.5
Пошаговое объяснение:π/6=30°
cos(π/6)=√3/2
cos(7π) = cos(π) =cos(180°) =(-1)
3*√3*√3/2*(-1)=9/2*(-1)= (-4.5)
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Ответ:-4.5
Пошаговое объяснение:π/6=30°
cos(π/6)=√3/2
cos(7π) = cos(π) =cos(180°) =(-1)
3*√3*√3/2*(-1)=9/2*(-1)= (-4.5)