Cos(3x)cosx-sin(3x)sinx=1
Cos(3x+1)=1
Cos(4х)=1
4х=arccos 1
4x = 0, 2п, 4п.....
х = 0, п/2, п..............
Cos(3x)cosx-sin(3x)sinx=1
Cos(3x+1)=1
Cos(4х)=1
4х=arccos 1
4x = 0, 2п, 4п.....
х = 0, п/2, п..............