- #1

ual8658

- 78

- 3

## Homework Statement

## Homework Equations

NONE

## The Attempt at a Solution

I'm trying to understand why the unit vector in the y direction is that formula. I get that e(theta) and e(r) are unit vectors used with polar coordinates that define direction and are perpendicular to each other always. What I don't get is their relationship with theta to get cartesian unit vectors.