Calculus, 9th edition
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3
| PAGE: 942 | SET: Exercises | PROBLEM: 3 |
Please look in your text book for this problem Statement
Directional derivative of a function :
If the unit vector is 
, then the directional derivative of the function 
is 
.
Find directional derivative of the function.
The function is 
, the point is 
and the vector is 
.
Find the unit vector 
:
.
Compare 
with 
.
and 
.
Directional derivative, 
.
Substitute the values 
, 
, and the point 
in above equation.
.
The directional derivative is 
.
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