Please give a warm-up quiz
Understand the problem
Source of the problem
Topic
Difficulty Level
Suggested Book
Generalized Directional Derivatives  By Pastor Karel
Start with hints
Now by the above definition can you try to solve the problem ???????
 The points on the straight line
So any point on the straight line would be of the form
Here the direction of the straight line would be
Now we have to consider the unit vector in that direction and so the unit vector would be Here the absolute value of the directional derivative would be
. Would you like to calculate this dot product?
 i.e the co-ordinates involving partial derivative of
. So,
Then (Ans) .
A graphical view point
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