Calculate the following expressions:
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.