Sin(x-п/4)= - (корень3)/2
Sin(x-π/4)=-√3/2 x-π/4=(-1)^n *arcsin(-√3/2)+πn, n∈Z x-π/4=(-1)^(n+1)*arcsin(√3/2)+πn, n∈Z x-π/4=(-1)^(n+1)*(π/3)+πn, n∈Z x=(-1)^(n+1)*(π/3)+π/4+πn, n∈Z