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Homework Help: What does sin(z with a hat) mean?

  1. Mar 21, 2007 #1
    1. The problem statement, all variables and given/known data

    Sorry for the non-technical term, but I need to use cauchy-riemann equations on sin(z hat) and cos(z hat) to prove they're not analytic... which I'm sure I could try if I knew what it mean... I know for elementary maths that it means conjugate... but I can't find anywhere in my text book which one to conj? If thats even what it is...

    2. Relevant equations

    sin(z) = [e^(iz) - e^(-iz) ] /2i

    3. The attempt at a solution

    so if thats the equation they want me to differentiate for C-R eqns then what is it's "hat" :) ....
  2. jcsd
  3. Mar 21, 2007 #2


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    Science Advisor
    Homework Helper

    "hat" of a+bi is a-bi. It's the complex conjugate, as you said.
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