Use Mathematica to complete number 3 as well as a picture of the Mathematica code needed.

Problem #2 Given the function f(x,y) = xy. Find fx and f, and graph f, fx and fy with domains and viewpoints that enable you to see the relationships between them. Problem #3 Given the function z = x2 + xy +3 y? Graph the surface and the tangent plane at the point (1,1,5). Choose the domain and viewpoint so that you get a good view of both the surface and the tangent plane. Then zoom in until the surface and tangent plane become indistinguishable