Directional derivative with angle

So the question is asking how the directional derivative of f(x,y,z) = xy + z^2 changes as you move in the direction of a vector that makes an angle of pi/4 with the gradient of f at point (2,2,3).In summary, the conversation discusses finding the directional derivative of a function in a specific direction, as well as clarifying the meaning of the direction given in the problem. It also touches on finding the unit vector along a given path and using it to calculate the directional derivative, as well as a question about finding the directional derivative in the direction of a given angle.
  • #36
-EquinoX- said:
hmm..are you sure?

Yes I'm sure, I've done it quite a number of times.
 

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