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Help with Simplification

  1. Jun 9, 2010 #1
    1. The problem statement, all variables and given/known data
    Hey, does anyone know how to further simplify this:

    2. Relevant equations
    ln(exp(-a) + exp(a))?

    3. The attempt at a solution
  2. jcsd
  3. Jun 9, 2010 #2


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    Homework Helper

    Re: Simplification

    There is no such rule as ln(x+y)=lx+lny if that is what you wanted to know. The most I can think of is that cosh(x)= 1/2(ex+e-x)
  4. Jun 9, 2010 #3
    Re: Simplification

    Thank you, this is good. I was after a trig simplification.
    I knew one for 2cos(x) = exp(-ix) + exp(ix) but couldn't remember one without the imaginary.
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