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I think the exact wording would help. If a, b and c must be real, then your proof is the whole proof of the result.
Well thanks for helping. It's nice to know you agree with me. But how to prove the result?????
I still don't get it. There is no mistake in your proof and your last post there proves that it must be that all three are equal...
Well yes, it does. But surely that can't be it alone. It's a bizarre way to ask that, isn't it?
Hi Bob
I'm stuck on Q1 from 