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QUESTION: Find the directional derivative of f(x,y)= x+y^2 at (3,4) in the direction of the tangent vector to the graph of 2x^2+y^2=9 at (2,1). I
QUESTION: Find the directional derivative of f(x,y)= x+y^2 at (3,4) in the direction of the tangent vector to the graph of 2x^2+y^2=9 at (2,1).
I know how to get the gradient of f but im having trouble finding the unit vector, please help.
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