Tricky to prove that both are equal. Is there a typo somewhere?

And apart from that: Your approach so far? What did you try, what did you find out?

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- June 14th 2012, 08:28 AM #1

- June 14th 2012, 08:44 AM #2

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- June 14th 2012, 08:49 AM #3

- June 14th 2012, 08:52 AM #4

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- June 14th 2012, 09:10 AM #5

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