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How can I solve Equations to complicated for Solve containing Tan[x]?

Posted 9 years ago
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Hi everyone, I have been working myself through pages of documentation to find out the functions and possibilities Mathematica offers. Nevertheless I am not able to solve following problem on my own:

inv[alpha_] := Tan[alpha] - alpha;
Solve[InvAlph == inv[Alpha], Alpha]

I suppose Solve is not the right function to solve this equation, due to infinite solutions, but I have not discovered the appropriate function jet. If anybody has any advice, I will appreciate it a lot! Thanks in advance David

2 Replies

That is exactly what I was looking for. Thank you very much!

In[13]:= inv[alpha_] := Tan[alpha] - alpha;
InvAlph = 0.0149044;
FindRoot[InvAlph == inv[alpha], {alpha, 1}]

Out[15]= {alpha -> 0.349066}
POSTED BY: Frank Kampas
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