Please give a warm-up quiz
Understand the problem
for 
Then the absolute value of the directional derivative of 
in the direction of the line 
, at the point 
is _____Source of the problem
Topic
Difficulty Level
Suggested Book
Generalized Directional Derivatives By Pastor Karel
Start with hints
in the direction of the unit vector 
is called the directional derivative and is denoted by 
. The defination of directional derivative is 
. Here if you consider 
to be 
and 
then we will get 
to be 
, 
and 
respectively. If you observe closely, this is nothing but differentiating the function 
w.r.t 
and 
keeping all the other thing constant.Now 
The points on the straight line 
Now we have to consider the unit vector in that direction and so the unit vector would be 
Then 
A graphical view point
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