(adsbygoogle = window.adsbygoogle || []).push({}); The problem statement, all variables and given/known data

http://s1.ipicture.ru/uploads/20111203/B1Ax1OcU.jpg

Frankly, i've been sitting starring at that problem for long enough, and it just can't be solved through the direct use of the standard hyperbolic identities. I need a hint.

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# Homework Help: Prove hyperbolic function

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