Помогите пож x-y=п  cosy*sinx=1/2

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