Hi I've been asked to prove
but I'm not sure how to go about it.
If I start;
I don't see how to go anywhere else but to prove that
(The latex is really messed up on this site & I can't put minuses & subscripts into the exponents, I've made it as reasonably clear as I can).
Moderator edit: No, the latex is not "really messed up on this site". You just don't know how to format the code. Reading the Latex Tutorial always helps: http://www.mathhelpforum.com/math-he...-tutorial.html.