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Homework Help: Expectation value of an operator in matrix quantum mechanics

  1. Oct 20, 2013 #1
    1. The problem statement, all variables and given/known data
    Hey everyone.
    Imma type this up in Word as usual:

    http://imageshack.com/a/img577/3654/q9ey.jpg [Broken]

    2. Relevant equations

    http://imageshack.com/a/img22/3185/pfre.jpg [Broken]

    3. The attempt at a solution
    http://imageshack.com/a/img703/8571/xogb.jpg [Broken]
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Oct 20, 2013 #2

    vanhees71

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    There's a mistake in the last step. You've overlooked the imaginary units in the exponentials!
     
  4. Oct 20, 2013 #3
    Ohhh yea it isnt [itex]cosh[/itex], it should be [itex]cos[/itex]...but is the rest okay? I mean the matrix U and stuff?
     
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