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    So the question is write down the maximal domain of ln(cosh x ) now graphically I've seen online that the answer is around 710.
    However, I'm struggling in proving this mathematically. And some help would be appreciated.
    I haven't come across hyperbolic functions before, although I know what they represent, in terms of e.

    Help would be appreciated.
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    (Original post by joe1545)
    So the question is write down the maximal domain of ln(cosh x ) now graphically I've seen online that the answer is around 710.
    However, I'm struggling in proving this mathematically. And some help would be appreciated.
    I haven't come across hyperbolic functions before, although I know what they represent, in terms of e.

    Help would be appreciated.
    I suggest that you sketch the graphs of \log(x) and of \cosh(x). Then, where are the problems going to be with \log(x)? Does the range of \cosh(x) intersect with this "problem set"?

    BTW, I'm not at all sure where you get 710 from...
 
 
 
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Updated: October 25, 2015
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