The directional derivative of a function f (x, y) at the point (1, 1) is 2 in
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Question:
The directional derivative of a function f (x, y) at the point (1, 1) is 2 in the direction of the unit vector ( 12 , 12 ), and 5 in the direction of the unit vector ( 15 , 25 ). Find the gradient of the function f (x, y) at the point (1, 1)
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