- #1

- 45

- 0

## Homework Statement

Calculate the following expressions:

## Homework Equations

## The Attempt at a Solution

Letting the vector a = (a_1, a_2, a_3) I've worked out that it's 2|a|^2

While that method is fairly quick, I don't particularly like it, and was wondering if there is a shorter or neater method using identities and such, perhaps using del^2 = del . del, then using div and grad identities? Cheers.