congnguyen congnguyen 13-09-2019 Mathematics contestada 1. 2cos I -2x + 43 cos4x = 4 cos x-12. 4 sin + cos +3= 4cos cos )3. 2cos2x+3cosx=2cos3x= 4sinx sin 2x4. 2+ 3(sin 2x-3sin x = cos 2x+3cosx5. 2cos^x+2/3 sin x cosx+1=3(sin x+ V3 cos x)
