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Everytime I try this with exponential it ends up being really messy and no doubt I'm cancelling something wrong or something similar. Is the exponential the only way to do it?

Mr F says: Read this for the derivation of a similar formula http://personal.maths.surrey.ac.uk/st/S.Gourley/hyperbolic.pdf
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Mr F says: Read this http://tartarus.org/gareth/maths/stuff/hyperbolic_functions.pdf
Same as above, my exponentials just get hugely messy..

Write

as an algebraic expression in x.

Is the only way to do this with the exponentials [do I have to use the answer above]? If so, same as the two above.

Thanks in advance,