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For f(x, y) = x2 + 4xy - y2 at the point P(2, 1), a) find...

For f(x, y) = x2 + 4xy - y2 at the point P(2, 1), a) find the unit vector u in the direction of steepest ascent; b) find the unit vector u in the direction of steepest descent; and c) find a unit vector u that points in the direction of no change in the function. show all work please

a)

b)

c)

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