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Homework Help: Rotating vectors

  1. Jul 18, 2012 #1
    1. The problem statement, all variables and given/known data
    This is an answer to a problem involving rotating vectors

    Screenshot2012-07-18at42030AM.png

    I can't figure out what the blank spaces mean. Are there 0's there? Are there 1's? Help.
     
  2. jcsd
  3. Jul 18, 2012 #2
    They are zeroes.
     
  4. Jul 18, 2012 #3
    good, thanks.
     
  5. Jul 18, 2012 #4

    LCKurtz

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    And the reason you can't see them is they are the same tannish-brown color as the background. I can see them because I'm colorblind. :smile:
     
  6. Jul 19, 2012 #5
    :)

    You can easily figure this out: all rotation matrices have determinant of 1 (so they are what's called orthogonal matrices). In fact, you can see that this matrix has determinant of -1, so technically it's not a rotation but some combination of reflection and rotation.
     
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