K
kittybabykut3_97


Giải pt:
1, cos3x+cos2x-cosx-1=0
2, 2sin^2x-5sinxcosx-8cos^2x=-2
3, -2tan^2-tanx+3=0
4,cos3x-4cos2x+3cosx-4=0
5,2sin^2x+3sinxcosx+cos^2x=0
1, cos3x+cos2x-cosx-1=0
2, 2sin^2x-5sinxcosx-8cos^2x=-2
3, -2tan^2-tanx+3=0
4,cos3x-4cos2x+3cosx-4=0
5,2sin^2x+3sinxcosx+cos^2x=0