If you have a directional derivative of zero and have been given the point, can you just find the gradient and set the directional derivative equation equal to 0?
so you get
gradient *<a,b>=0
then use the dot product to find what the vector is that would make this zero?
am I right?
so you get
gradient *<a,b>=0
then use the dot product to find what the vector is that would make this zero?
am I right?
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