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I have to show the inversion of the "S-matrix":

S-Matrix

To obtain the "C-Matrix" in the form: C-Matrix

which are the relevant instructions/commands for either (wx)Maxima or XCAS?

TIA & BR

Robert Dodier
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mily
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    Try `detout: true; invert_by_adjoint(S);` which factors out 1/(determinant of S). Note that the neat forms of expressions which are presented in books often require some insight as to how they can be derived -- automated systems like Maxima often return something which is equivalent to the neat form, but messy. Sometimes `ratsimp`, `factor`, `expand`, or other expression-rearranging functions can help. – Robert Dodier Oct 21 '21 at 16:56

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