If parallel means a scalar multiple, then , where is some number. Would that not cover the parallel vectors? I think this is the difference between this problem and the one I posted before.
If parallel means a scalar multiple, then , where is some number. Would that not cover the parallel vectors? I think this is the difference between this problem and the one I posted before.
You are overthinking this problem!
If we want a directional derivative parallel to we change that vector to the following: .
You make the vector into a unit vector.
Again I say that you are over thinking this problem.