2cos 3x+√3=0
2сos3x=-√3
cos3x=-√3/2
3x=arccos(-√3/2)+2pi*n
3x=5pi/6+2pi*n
x=5pi/18+2pi*n/3
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2cos 3x+√3=0
2сos3x=-√3
cos3x=-√3/2
3x=
arccos(-√3/2)+2pi*n
3x=
5pi/6+2pi*n
x=
5pi/18+2pi*n/3