# Homework Help: Simple question in Del operator on plane wave equation

1. Oct 11, 2014

### baby_1

Hello
question is:
As you see when we do del operator on A vector filed in below example it removes exponential form at the end.why does it remove exponential form finally?

2. Oct 11, 2014

### vela

Staff Emeritus
It doesn't. The exponential is part of $\vec{A}$.