Система
x+y=pi
sinX+siny=-корень из 2

sinX+sinY=2*sin((x+y)/2)*cos((x-y)/2)=2*sin(PI/2)*cos((x-y)/2)=-sqrt(2);cos((x-y)/2)=-sqrt(2)/2(x-y)/2=3/2*pix-y=3*pix+y=pix-y=3pi2x=4pi; x=2piy=-pi