You have to prove that:

It can be useful to write a few terms of the summation:

Do you notice a 'special' serie? Can you continue?

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- November 6th 2011, 11:21 AM #1

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- Jan 2011
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- November 6th 2011, 12:11 PM #2

- November 6th 2011, 07:15 PM #3