y=x^2 ; dy=2xdx

A=int(L){Pdx+Qdy}=int(0;2){x^2dx+ydy}=int(0;2){x^2dx+x^2*2xdx}=
=int(0;2){(x^2+2x^3)dx}=8/3+16/2=8/3+8=32/3