How to prove that ?

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- August 6th 2009, 09:41 AMSoldadoSum
How to prove that ?

- August 6th 2009, 10:32 AMred_dog
Let

Then

Add the equalities:

- August 6th 2009, 01:24 PMSoldado
Thanks but, I don't see how did you get ? I can't follow that equality, I was trying to figure out by myself but I couldn't.

- August 6th 2009, 02:08 PMAmer