# Derive the r, theta, and phi unit vectors?

1. Mar 6, 2006

### Living_Dog

DJGriffiths, 3rd ed., Prob 1.37: derive the $$\hat{r}$$, $$\hat{\theta}$$, and $$\hat{\phi}$$ unit vectors in terms of $$\hat{x}$$, $$\hat{y}$$, and $$\hat{z}$$.

I know the formula and how to find them, but derive them?? ...unless this is what is meant?

tia,
-LD

Last edited: Mar 6, 2006
2. Mar 6, 2006

### quasar987

I believe that is what it meant. Find them in terms of x,y,z.

3. Mar 6, 2006

### Living_Dog

Ok! That's easy. Why Griffith used the word "derive" - as if from first principles - is beyond me.

thx, i needed that! :)

-LD

Last edited: Mar 6, 2006