1)а=30 градусов
(1-cos(2*30))sin(2*30)-sin(4*30)+sin30 = 1/2 +√3/4 = (2 +√3)/4
2)а=60градусов
(1-cos(2*60))sin(2*60)-sin(4*60)+sin60 = 7√3/4
1)а=30 градусов
(1-cos(2*30))sin(2*30)-sin(4*30)+sin30 = 1/2 +√3/4 = (2 +√3)/4
2)а=60градусов
(1-cos(2*60))sin(2*60)-sin(4*60)+sin60 = 7√3/4