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

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

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

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

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

# Ex 1: Find a Value of a Directional Derivative – f(x,y)=xy

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

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

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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.