Find the partial derivative fxf_xfx of the function f(x,y)=x2y+3y3f(x, y) = x^2y + 3y^3f(x,y)=x2y+3y3.
2x+3y22x + 3y^22x+3y2
x2+9y2x^2 + 9y^2x2+9y2
2xy+3y32xy + 3y^32xy+3y3
2xy2xy2xy