Численный ответ
4.0*x^2*y^2*(5.0*x^2 - 4.0*x*y)
4.0*x^2*y^2*(5.0*x^2 - 4.0*x*y)
4.0*x^2*y^2*(5.0*x^2 - 4.0*x*y)
4.0*x^2*y^2*(5.0*x^2 - 4.0*x*y)