Determine the value of the mixed partial derivative fxyf_{xy}fxy for the function f(x,y)=4x2y−2xy3f(x, y) = 4x^2y - 2xy^3f(x,y)=4x2y−2xy3.
8x−6y28x - 6y^28x−6y2
8x+6y28x + 6y^28x+6y2
4x2−6xy24x^2 - 6xy^24x2−6xy2
8y−6x28y - 6x^28y−6x2