- #1

rock.freak667

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## Homework Statement

Prove that p(q.rXs)-q(r.sXp)+r(s.pXq)-s(p.qXr)=0

Where p,q,r,s are vectors and X denotes the cross product.

## Homework Equations

## The Attempt at a Solution

So far all I have is this ( I can't get any further after)

q.rXs=r.sXq=s.qXr

r.sXp=p.sXr=s.rXp

s.pXq=q.sXp=p.qXs

p.qXr=r.pXq=q.rXp.