Major Topic 2: Partial Derivatives (a) Give an equation for the plane tangent to f(x, y) = cos(aly?) - # at the point (0, 3). (b) Set g(x, y) = ry' - In(2r - y). Use a linear approximation to estimate g(1.1, .9). (c) Let h(x, y, z) = ery _ #2. Compute all three partial derivatives of h