# Math Help - show ∇ · (a × b) = b · (∇×a) − a · (∇×b) {solution inside, need explanation}

1. ## delete this

delete this plz, i was a bit rusty :S

2. Originally Posted by rubix
http://i47.tinypic.com/dhbhz.png

^ solution

my question is how did they get from 2nd to 3rd step. The part with a_x, a_y, a_z etc

Thanks!
ok.