Question: 2x 3y f(x, y) = x + y . (a) Find the gradient of f at the point (2,-1) . (b) Find the unit

2x 3y f(x, y) = x + y . (a) Find the

2x 3y f(x, y) = x + y . (a) Find the gradient of f at the point (2,-1) . (b) Find the unit vector u such that Duf (2,-1) is at its maximum value, and then find that maximum value. (c) Find the two unit vectors U1 and U2 such that Duf (2,-1)=0

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