For the function f(x,y)=x3y2−x2f(x,y) = x^3 y^2 - x^2f(x,y)=x3y2−x2, what is the mixed second-order partial derivative fyxf_{yx}fyx?
6xy6xy6xy
6x2y6x^2 y6x2y
3x2y23x^2 y^23x2y2
2x3y2x^3 y2x3y