Как решить? Y=2 sin(x/2-П/4)
2sin(x/2-π/4)=2·(sinx/2·cosπ/4-sinπ/4·cosx/2)=2·(sinx/2·√2/2-√2/2·cosx/2)= 2·√2/2·(sinx/2-cosx/2)=√2(sinx/2-cosx/2)