example1 := (53+43*x^2+92*x*y-91*x-88*y^2-48*y)/(71-28*x^2+5*x*y+13*x-10*y^2-\
82*y)*exp((98+16*x^2+83*x*y+9*x-60*y^2-83*y)/(96-48*x^2-19*x*y+62*x+37*y^2+5*y
));