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Taylor development

  1. Jan 27, 2009 #1
    1. The problem statement, all variables and given/known data

    Hey guys.
    I need to develop Taylor series for this function (cos(z) * cosh(z)).
    I know the Taylor development for cos and the Taylor development for cosh but I have no idea how to combine the two, if it's possible, any idea guys?
    And another thing, does it matters if we are talking about the complex field?

    Thanks a lot.


    2. Relevant equations



    3. The attempt at a solution
     

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  2. jcsd
  3. Jan 27, 2009 #2

    cosq= (eiq+ e-iq)/2.
    coshq= (eq+ e-q)/2.

    might help but you image is yet to be approved.
     
  4. Jan 27, 2009 #3
    Oh, I see.
    I'll try it.
    Thanks a lot.

    BTW the image only shows the function "cosz * coshz" and the Taylor series of this two functions.
     
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