1+sin2x=24sin^2xcos^2x=6*sin^2(2x)
sin2x=t
6t^2-t-1=0
t=1/2
t2=-1/3
sin2x=1/2 2x=П/6+2Пk 2x=5П/6+2Пk
x=П/12+Пk x=5П/12+Пk
sin2x=-1/3 2x=arcsin(-1/3)+2пk
x=1/2arcsin(-1/3)+пk
