Question: How do I calculate the Determinant of a symbolic Matrix correct?

I'm Trying to calculate the Determinant of a 3 x 3 Matrix with symbolic entries with maple 15. But the Determinat function gives a wrong result. From the C+A-1 expression it uses only the C and ignores the rest.

When I calculate it "manually" the result is correct.

Here is what I'm doing:


The Maple file is attached to this question.

Thank you for your help !



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