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Modulus of complex number

  1. Jun 15, 2012 #1
    1. The problem statement, all variables and given/known data

    Find |exp(√i)|.


    2. Relevant equations



    3. The attempt at a solution

    I scanned my working as attached, it seems ok to me but I dont understand why it's wrong..


    The answer scheme ignores the exp(i sin (pi/4) ) part and writes the answer as exp(cos (pi/4)) = exp(1/√2).

    Would appreciate any help!
     

    Attached Files:

  2. jcsd
  3. Jun 15, 2012 #2

    SammyS

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    attachment.php?attachmentid=48368&d=1339770269.jpg

    Isn't cos(π/4) = (√2)/2 ?
     
  4. Jun 15, 2012 #3
    just discovered my mistake!!! thanks anyway guys :)
     
  5. Jun 15, 2012 #4
    initially i was wondering why they ignored the complex part, but it works out to become this:
     

    Attached Files:

  6. Jun 15, 2012 #5
    sorry for the trouble!
     
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