Derive the expression
Using and and
I can get
But can't see how to get , probably easy but can't see it.
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Hint: Try dividing C+D from RHS and multiplying A-B from LHS.
Hi, I've done that but still drawing a blank, I keep going round in circles. Going to have a break.
Sorry, is there another small hint?
Can you try squaring the terms and simplifying to show that the result holds? (In other words, square both sides and collect together)
Hi, got it, was staring me in the face, many thanks. Bob
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