Найти множество значений функции y=sin(x-π/4) на множестве решений неравенства |x-2π/3|

-π/4<x-2π/3<π/4
-π/4+2π/3<x<π/4+2π/3
5π/12<x<11π/12
y(5π/12)=sinπ/6=1/2
y(11π/12)=sinπ/3=√3/2
y∈(1/2;√3/2)