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Inverse Trig - Writing in Algebraic Expressions - Need help

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squance:
I can't seem to get the right answer to this question...

Write cosh (2arctanh x) as an algebraic expression in x.
 i let y = 2 arctanh x
           x/2 = tanh x

And I used the 1 - tanh^2 y = sech^2 y identity...

But I can't seem to get the answer of  (1+ x^2)/(1-x^2)

I got 1/sqrt (1-4x^2)

HELP!!! :'(

Mao:


[1] was derived as follows:

squance:
Hey thanks :)

But I actually solved this question with some help from some people on IRC :)

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