(x+y)^2-3xy=4.....xy=5/3.,,x^2+y^2=17/3...x^3y+xy^3=xy(x^2+y^2)=85/9
x^2+y^2-xy=4x^2+y^2+2xy=4+3xy(x+y)^2=4+3xy x+y=33xy=5xy=5/3 x^3y+xy^3=xy(x^2+y^2)=xy(4+xy)=5/3(4+5/3)=85/3
85/ 3
