Prove that (cos4x + sin4x) = 1/2 (2 - sin22x) Share with your friends Share 1 Anuradha Sharma answered this Dear student, LHS, cos4x+sin4x= cos2x+sin2x2-2sin2xcos2x= 1-2sin2xcos2x=1-124sin2xcos2x= 1-12sin2x2=2-sin22x2= 122-sin2x=RHS Regards 2 View Full Answer
