example19 := (-96+49*x^3-58*x^2*y+49*x^2+x*y^2-95*x*y+86*x-97*y^3-14*y^2+83*y)
/(-95-8*x^3-54*x^2*y+62*x^2+96*x*y^2-51*x*y+89*x+14*y^3-79*y^2-58*y)*((61*x-2*
y+86)/(57*x-35*y+57))^(1/2)*exp((-15+28*x^3+63*x^2*y+21*x^2-71*x*y^2-66*x*y-34
*x+72*y^3-40*y^2-68*y)/(48-32*x^3+17*x^2*y+87*x^2-60*x*y^2+7*x*y-61*x+45*y^3-\
50*y^2-22*y));