Ctg (1\2x-π\4)=1 cos(x-π\3)=0
Ctg(1/2)*x-(π/4) = 1 ctg1/2x-π/4 = 1 x = 1 / ((- π/4 + x*ctg(1/2))/x) ответ: x = ( π/4 + 1)*tan(1/2)