I have a picture of a problem and the answer. But a place in the answer I can't understand how they get from one function to the next, could you guys please explain it? I have marked it in red?(adsbygoogle = window.adsbygoogle || []).push({});

http://img381.imageshack.us/img381/1839/hyperik2.png [Broken]

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# Hyperbolic functions

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