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For the function f(x, y)=ln(1+xy) a.Find the value of the directional derivative of f at the...

For the function f(x, y)=ln(1+xy)

a.Find the value of the directional derivative of f at the point (-1, -2) in the direction <3,4>.

b.Find the unit vector that gives the direction of steepest increase of f at the point (2,3).

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