For the function f(x,y)=x2eyf(x, y) = x^2 e^yf(x,y)=x2ey, find the mixed second-order partial derivative fyxf_{yx}fyx.
x2eyx^2 e^yx2ey
2yey2y e^y2yey
2ey2e^y2ey
2xey2x e^y2xey