- #1

EarthDecon

- 9

- 0

## Homework Statement

I just want to know how to get from this: ∂ø^/∂ø = -x^cosø - y^sinø

to this: = -(r^sinθ+θ^cosθ)

## Homework Equations

All the equations found here in the Spherical Coordinates section: http://en.wikipedia.org/wiki/Unit_vector

## The Attempt at a Solution

I've tried a bunch of ways of algebraically getting the answer but I seem to be getting nowhere. Maybe I'm missing an equation. I tried adding and subtracting z^cosθ to get -r^ but I'm still missing the other piece. Please help! Thanks so much.