-2sin(x+n/4)=корень 3
-2sin(x+π/4)=√3
sin(x+π/4)=√3/2
x+π/4=π/3+2πn
x+π/4=2π/3+2πn
x=π/3-π/4+2πn
x=2π/3-π/4+2πn
x=π/12+2πn
x=5π/12+2πn, n принадл. Z.