Ex 2: Find a Value of a Directional Derivative - f(x,y)=x^n*y^m

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This video illustrates the tangent line to the 3D surface to illustrate the meaning of the value of a directional derivative.
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ur content is so helpful...keep posting thanks sir!!!

srinivasansrinivasan
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Why was it 1/sqrt13 and not (3/sqrt13, 2/sqrt13)?

cedricknarsiso