example7 := (63+37*x^2-59*x*y-54*x-22*y^2+17*y)/(-17+21*x^2-12*x*y-21*x-74*y^2
+55*y)*((83*x-65*y-28)/(-5*x+27*y))^(1/2)*exp((-12+26*x^2+13*x*y+83*x-19*y^2-\
62*y)/(76+48*x^2-84*x*y-83*x+96*y^2+6*y));