value of cos120 Share with your friends Share 1 Yas Bin Reza answered this cos 120 = cos (180 - 60) = - cos 60 1 View Full Answer Sindhu answered this I think cos60 = cos120 =1/2 0 Kanishk Singh answered this Cos 60= -1/2 100% sure 0 Adya Singh answered this cos 120 = -1/2 1 Kanishk Singh answered this Sorry cos 120 0 Aditi Rao answered this Cos 120 =cos(180-60)= -cos(60) = -root3/2 1 Tanubha Majumder answered this -1/2 0 Satyam Kumar Singh answered this -1/2 1 Potterhead answered this Value of cos 120degree is -1/2. But if u want the exact value of cos 120 degree then it is -0.5. I tell how.see:- cos120=cos(180-60) =-cos(60) (i.e;cos(180-thita)= -cos(thita) =- 1/2 (cos60=1/2) =-0.5 Hope dis helped u.... 1 Misty Bajpai answered this value of cos 120 = -cos60 = -1/2 0 Devansh Dubey answered this -1/2 1 Preeti answered this -1/2 0 Aakhya Verma answered this -1/2 1