C
chichchoe96


1.2cos2x-(sinx+cosx).sinxcosx=0 


2.cos3x-4cos2x+3cosx-4=0
3.sin^3x-cos^3x+1=1/2sin2x
4.(2cos3x-1)(2sinx+cosx)=sin2x-sinx=((=((=((
2.cos3x-4cos2x+3cosx-4=0
3.sin^3x-cos^3x+1=1/2sin2x
4.(2cos3x-1)(2sinx+cosx)=sin2x-sinx=((=((=((