- #1

Amaelle

- 310

- 54

- Homework Statement
- the directional derivative of the function f(x,y) in respect to the point(0,0) according to the vector v(1,2) is equal to

- Relevant Equations
- directional derivative

this is the function

and this is the solution in which the definition has been used

my question is

Why we can not use the traditional approach? I mean calculation the partial derivative which equals 0 in our case? And doing the dot product with the vector v (after normalizing it)

many thanks in advance

and this is the solution in which the definition has been used

my question is

Why we can not use the traditional approach? I mean calculation the partial derivative which equals 0 in our case? And doing the dot product with the vector v (after normalizing it)

many thanks in advance