Помогите пож x-y=п  cosy*sinx=1/2

x-y=π⇒x=π+ycosy*sinx=1/2cosy*sin(π+y)=1/2cosy*(-siny)=1/2-1/2*sin2y=1/2sin2y=-12y=-π/2y=-π/4x=π-π/4=3π/4---------------------------------cos(-π/4)*sin3π/4=cosπ/4*sinπ/4=√2/2*√2/2=2/4=1/2