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Finding the inverse?

  1. Sep 24, 2006 #1
    Find the inverse of A given by:
    [tex]A = \left[\begin{array}{ccc}\cos \phi & -\cos \theta \sin \phi & \sin \theta \sin \phi \\\sin \phi & \cos \theta \cos \phi & -\sin \theta \cos \phi \\0 & \sin \theta & \cos \theta\end{array}\right][/tex]

    I have never encountered a problem in Matrices involving long trigonometric functions. How do I find the inverse? Should I use the same row-reduction method for this?
  2. jcsd
  3. Sep 24, 2006 #2
    Use whatever method you prefer (I like the transposed cofactor matrix method, personally). Once you specify [itex]\theta, \ \phi[/itex], they're just numbers (you should, of course, check to make sure that there are no values of these that stop the matrix from being invertible!).
    Last edited: Sep 24, 2006
  4. Sep 24, 2006 #3
    Ok, thanks a lot! I will try it out.
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