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the function f(x; y) = xye^x-y, at the point (2; 2) (1)find the gradient. (2) find...

the function f(x; y) = xye^x-y, at the point (2; 2) (1)find the gradient. (2) find the directional derivative in the direction of the vector 3i - j. (3)find the direction of which unit vector is the rate of increase maximum? What is the maxi- mum rate of increase? (4)find the direction of which unit vector(s) is the directional derivative zero?

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