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I want to solve transcendental equations by Mathematica 7. Solve does not help me, reduce - as well. Seams that I shoulkd use FindRoot, but it does not give all solutions. It gives only one solution. So how can I solve transcendental equations?

Here is the equation I want to solve:

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So for a fixed value of L, A1, A2 (L >= 0 and is an integer) parameters I want to find all values for k expressed with A1 and A2, for which the determinant is 0. In addition I must say that A1 and A2 >0.

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    Can you give an example of an equation you want to solve?2011-02-20

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