2. Solve the following individual problems. You must show your work to get full credits. (a) 4 points Find equation of the tangent plane at point P(2, 1, 7) on the graph of z = f(x, y) when f.(2, 1) = 3, fy(2, 1) = -2 (b) 5 points Sketch the region of integration and change the order of integration. M408D Ke Chen (c) 4 points Find the Jacobian of the transformation T: = = 3e 'cos 0, y = 4e" sin 0