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Homework Statement
Compute the following:
[itex] \int \frac{cosh(x)}{cosh^2(x) - 1}\,dx [/itex]
Homework Equations
[itex] \int cosh(x)\,dx = sinh(x) + C [/itex]
The Attempt at a Solution
I had no clue where to start, so I went to WolfRamAlpha, and it used substitution but it made [itex] u = tanh(\frac{x}{2}) [/itex] and I had no clue how I am supposed to know to do that.
Any advice on where to start is greatly appreciated.