I *think* the following is what is in your post:
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[ATTACH=full]4113[/ATTACH]
Then:
[ATTACH=full]4114[/ATTACH]
Then:
[ATTACH=full]4116[/ATTACH] = ??
[ATTACH=full]4117[/ATTACH] = ??
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I'm not sure what is meant by the rest of your post...? Are you proposing a formula, and are asking for assistance in proving it? If not, what (precisely) is your question?
Thanks!