Homework Statement
Show that (u+v) x (u-v) = 2v x u
Homework Equations
being u=(x1,y1,z1)
and v= u=(x2,y2,z2)The Attempt at a Solution
I've got 2v x u equals:
(2y2.z1 - 2z2.y1) + (2x2.z1 - 2z2.x1) +
(2x2.y1 - 2y2.x1)
But I'm nearly to melt my mind to prove (u+v) x (u-v) = above