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Homework Help: Calculate/approximate the integral E(log|tanh(x/2)|)

  1. Jan 4, 2012 #1
    1. The problem statement, all variables and given/known data
    I want to calculate/approximate the integral [itex] E[log|tanh(x/2)|] [/itex] where E is expected operator and x is a Normally Distributed Random Variable [itex] N(\mu, 2\mu) [/itex] where [itex] 2\mu [/itex] is standard deviation. I am trying to find an approximation to this integral as a function of [itex]\mu[/itex]. So in summary I want to find

    [itex]f(\mu) ≈ E[log|tanh(x/2)|] [/itex]

    2. My Try
    I know there exists Jensen's Inequality but don't know how different results will be if I take expectation operator inside the function.
  2. jcsd
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