Please help with practice example problem 1 and 2.

1.

Find the points on the graph of z = xy3 + 832'] where the tangent plane is parallel to 9x + 5y + 9z = 0. (Give your answer as a comma-separated list of points in the form (4:, *, *). Express numbers in exact form. Use symbolic notation and fractions where needed.) Find the equation of the tangent plane to the graph of G(u, w) = cos (uw) at the point (g, g). (Use symbolic notation and fractions where needed. Enter your answer using u-, w-, zcoordinates.) the equation