Find the partial derivative fxf_xfx for the function f(x,y)=x3+4xy2f(x, y) = x^3 + 4xy^2f(x,y)=x3+4xy2.
3x2+4y23x^2 + 4y^23x2+4y2
3x2+8xy3x^2 + 8xy3x2+8xy
x2+4yx^2 + 4yx2+4y
3x2+4x3x^2 + 4x3x2+4x