example3 := (34+12*x^3-25*x^2*y-96*x^2+50*x*y^2-60*x*y-42*x+7*y^3-89*y^2-70*y)
/(80-68*x^3-60*x^2*y+16*x^2+52*x*y^2-20*x*y-4*x-89*y^3-77*y^2+69*y)*exp((97+28
*x^2-42*x*y-33*x+21*y^2-35*y)/(-69+30*x^2-64*x*y+89*x-16*y^2+59*y));