Let alpha, beta be such that pi<alpha-beta<3pi.If sin alpha+sin beta =-21/65 and cos alpha+cos beta=-27/65 then the value of cos (alpha-beta/2) Share with your friends Share 1 Gaurang Yadav answered this cvcv -10 View Full Answer Ramakrishna answered this -6/65 -10 Pinky Pink answered this This will help... 0
