# Curl (A X B) value

1. Mar 19, 2012

### sravan_r

1. The problem statement, all variables and given/known data

The problem is to find the value of Curl of A X B.

I used the usual vector triple product formula to write as below.

Δ X (A X B) = (Δ.B)A - (Δ.A)B = (div B)A - (divA)B

2. Relevant equations

But this is not the answer. Please suggest where i was wrong.

3. The attempt at a solution

2. Mar 19, 2012

### Ray Vickson

Carry out the steps explicitly: $$[\nabla \times (A \times B)]_x = \frac{\partial}{\partial y} (A \times B)_z - \frac{\partial}{\partial z} (A \times B)_y,$$ etc.

RGV