- #1

- 2

- 0

**Mod note: Moved from a Homework section**

1. Homework Statement

1. Homework Statement

I want to solve:

∇

^{2}E, for E = exp(ikr)/r, where r = √x

^{2}+y

^{2}+z

^{2}

Thus I must solve:

d

^{2}E/dx

^{2}+d

^{2}E/dy

^{2}+d

^{2}E/dy

^{2}

The derivatives themselves are simple, but very time-consuming! Can you think of any tricks I can use to simplify the calculation?

Last edited by a moderator: