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Find the directional derivative of f(x,y) = 4x^2y-3xy^2+y^3-9 at P(2,1) in the direction of 2i – 3j. Is the function increasing or decreasing in this direction?

Find the directional derivative of f(x,y) = 4x^2y-3xy^2+y^3-9 at P(2,1) in the direction of 2i – 3j. Is the

function increasing or decreasing in this direction?

 
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