ctg (1\2x-π\4)=1

cos(x-π\3)=0

ctg(1/2)*x-(π/4) = 1ctg1/2x-π/4 = 1x = 1 / ((- π/4 + x*ctg(1/2))/x)ответ: x = ( π/4 + 1)*tan(1/2)