Directional Derivative
Directional Derivative : Derivative of a function along any given specific direction
represents a surface.
Directional Derivative of along the direction of vector is dot product of with unit vector along
Significance of Directional Derivative:
In the following activity you can change the function to find directional derivative at the point input and along the vector .
gives direction of maximum change.
Significance of Directional Derivative ():
if there is a very small change in the input along the direction of vector , then corresponding change in the output will be times the evaluated at