If f(x,y)=x2y3f(x,y) = x^2 y^3f(x,y)=x2y3, calculate the mixed second-order partial derivative fxyf_{xy}fxy.
6xy26xy^26xy2
2y32y^32y3
3x2y23x^2 y^23x2y2
6x2y6x^2 y6x2y