Question: Please help us with the three with these. Thank you kindly. Let f(x,y) = x/y.Find the gradient of f at the point (2,1). Let f(x,y)

Please help us with the three with these. Thank you kindly.

Let f(x,y) = x/y.Find the gradient of f at the point (2,1).

Let f(x,y) = x/y. Find the directional derivative of f at the point (2,1) in the direction of the vector v = <3,4>.

Let f(x,y) = ycos(xy). Find the directional derivative of f at the point (2,1) in the direction given by the angle=/4

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