Derive the expression

Using

and

and

I can get

But can't see how to get

, probably easy but can't see it.

James

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- Apr 22nd 2013, 04:03 AMbobredDerive the expression
Derive the expression

Using

and

and

I can get

But can't see how to get

, probably easy but can't see it.

James - Apr 22nd 2013, 04:24 AMchiroRe: Derive the expression
Hey bobred.

Hint: Try dividing C+D from RHS and multiplying A-B from LHS. - Apr 22nd 2013, 10:42 AMbobredRe: Derive the expression
Hi, I've done that but still drawing a blank, I keep going round in circles. Going to have a break.

- Apr 24th 2013, 02:12 AMbobredRe: Derive the expression
Sorry, is there another small hint?

- Apr 24th 2013, 05:18 PMchiroRe: Derive the expression
Can you try squaring the terms and simplifying to show that the result holds? (In other words, square both sides and collect together)

- Apr 25th 2013, 03:39 AMbobredRe: Derive the expression
Hi, got it, was staring me in the face, many thanks. Bob