L
loverain22


giải pt:
1) (1+sin x)^2 = cos x
2) sin4x - cos 4x = 1+4( sinx - cosx)
3) cos 2x -căn3.sin2x -căn3.sinx.cosx +4 =0
4) sin^6 x + cos^6 x = 3/2
1) (1+sin x)^2 = cos x
2) sin4x - cos 4x = 1+4( sinx - cosx)
3) cos 2x -căn3.sin2x -căn3.sinx.cosx +4 =0
4) sin^6 x + cos^6 x = 3/2