1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook