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Rotation of axis quesion

  1. May 7, 2007 #1
    1. The problem statement, all variables and given/known data

    The question si the make a rotation of axis to elmininate the cross-product term in the work i provided in this pic: http://img295.imageshack.us/img295/9579/untitledtu4.png

    2. Relevant equations



    3. The attempt at a solution

    I've drawn of the example in the pic i've given a link.

    my questions:

    how do i know that 2 theta = pi/3 and theta is pi/6

    where does the sqrt(3)/2 and 1/2 come from?

    i know there is some kind of 30/60/90 triangle going on here i think.
    can someone please help me understand where the numbers are coming from.

    if you expand the pic its MUCH easier to view.

    thankyou.
     
  2. jcsd
  3. May 7, 2007 #2
    Last edited: May 7, 2007
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