Show Tangent Lines to a Surface Using 3D Calc Plotter – Directional Derivative

This video using 3D Calc Plotter to illustrate the meaning of a directional derivative.

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Ex 3: Find a Value of a Directional Derivative – f(x,y)=ln(x^2+y^2)

This video illustrates the tangent line to the 3D surface to illustrate the meaning of the value of a directional derivative.