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Math Help - a kind of trigonometry proving.

  1. #1
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    Post a kind of trigonometry proving.

    greet guys, (hyperbolic not trigonometry)

    since sinh-1 (x) = ln(x + surd(x^2 +1) )
    cosh-1 (x) = ln(x + surd(x^2 -1) )

    therefore, prove that sinh-1 (x) = (cosh-1(surd(x^2 +1))

    anyone please..
    Last edited by vocyber; January 16th 2010 at 09:40 PM. Reason: correct jhevon? got solution?
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by vocyber View Post
    greet guys, (hyperbolic not trigonometry)

    since sinh-1 (x) = ln(x + surd(x^2 +1) )
    cosh-1 (x) = ln(x + surd(x^2 -1) )

    therefore, prove that sinh-1 (x) = (cosh-1(x))(surd(x^2 +1))

    anyone please..
    this isn't true. make sure you posted the right problem.
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