(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Prove that (A x B) . (u x v) = (a.u) (b.v) - (a.v)(b.u)

3. The attempt at a solution

I've used lagrange indentity to proof that. but I can't go ahead

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Using Lagrange Iden. to proof

**Physics Forums | Science Articles, Homework Help, Discussion**