cos 3alfa + 5 sin 2alfa alfa=60 градусов

Question

cos 3alfa + 5 sin 2alfa

alfa=60 градусов

Answer 1

 cos 3alfa + 5 sin 2alfa
alfa=60 градусов

cos 3 *60 + 5*cos 2*60 = cos 180 + 5* cos 120 = 0 - 5*1/2 = -2.5