S
sweet_love8


giải pt:
1) (1+2sinx)^2.cosx =1 +sinx +cosx
2) cosx - 2cos3x = 1+căn3.sinx
4) 2sin^3 x +4cos^3 x =3sin x
3) cos^2 x/2 + cos^2 3x/2 -sin^2 2x -sin^2 4x =0
1) (1+2sinx)^2.cosx =1 +sinx +cosx
2) cosx - 2cos3x = 1+căn3.sinx
4) 2sin^3 x +4cos^3 x =3sin x
3) cos^2 x/2 + cos^2 3x/2 -sin^2 2x -sin^2 4x =0