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I Need Aproximate expressions for : ln(x) and 1/ln(x) Thanks

  1. Nov 1, 2017 #1
    Hi there:
    I am looking for approximate expressions for the two functions: ln(x) and 1/ln(x) . Any help?
    Thanks in advance.
  2. jcsd
  3. Nov 1, 2017 #2


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    Staff: Mentor

    Approximations where, for what? Did you try Taylor expansions?
  4. Nov 1, 2017 #3


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    Science Advisor

    ln(x) is not analytic at x=0. You need to use a series around some other value. If you use the series for ln((1+x)/(1-x)) you will able to get a series for any y=(1+x)/(1-x) for -1<x<1.
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