Radical Edward Posted April 15, 2003 Share Posted April 15, 2003 can anyone think of a clever way to find the determinant of the following matrix, preferably by row reduction and laplace development: |cos:lctheta: 1 0| | 1 2cos:lctheta: 1| | 0 1 2cos:lctheta:| I know the answer, that isn't the problem, but I hate multiplying out entire matrices. Link to comment Share on other sites More sharing options...
Dave Posted April 15, 2003 Share Posted April 15, 2003 ick, matrices. I can't do these (because I've never looked at them) but I'll see what I can find out for you. Link to comment Share on other sites More sharing options...
Radical Edward Posted April 15, 2003 Author Share Posted April 15, 2003 thanks, the answer is cos3:lctheta: by the way. I can do it by just finding the determinant and using trig identities, but I just wondered if there was a clever way Link to comment Share on other sites More sharing options...
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