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find the directional derivative of f(x,y) = x^2y^3 +2x^4y at the point (3,-1) in the direction...

find the directional derivative of f(x,y) = x^2y^3 +2x^4y at the point (3,-1) in the direction theta= 5pi/6

the gradient of f is f(x,y)=

the gradient of f (3,-1)=

the directional derivative is:

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