1, cos^2x+sinx+1=0
2, 2sin^2x+5cosx+1=0
3,7sin^2x+cos2x+sinx+1=0
4, 2sin^2x +cos^2x+sinx-1=0
5,sin(π/6+x)-cos(π/3+2x)+4=0
6, 5-4sin^2x -8cos^2 x/2+4=0
7, 4/cos^2x +tanx-7=0
Loga
Sinh Học lớp 12
