Ctg (2x-pi/4)= корень из 3/3
Ctg(π/4-2x)=✓3 -Ctg(2x-π/4)=✓3 Ctg(2x-π/4)=-✓3 2x-π/4=arcctg(-✓3)+πn,n€Z 2x-π/4=5π/6+πn,n€Z 2x=5π/6+π/6+πn,n€Z 2x=π+πn,n€Z x=π/2+(πn)/2n€Z