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That depends what either the value of a or the value of b is.
It means that if you substitute b for a, c for b and a for c the value of the determinant remains unchanged.It means that if you substitute b for a, c for b and a for c the value of the determinant remains unchanged.It means that if you substitute b for a, c for b and a for c the value of the determinant remains unchanged.It means that if you substitute b for a, c for b and a for c the value of the determinant remains unchanged.
The expression (a+b) + (a-b) can be rewritten as a + b + a - b = 2a.There is no need to use absolute value.
Don't know value of B, but if you can assign value-11
If a = 26 and b = 6 then a - b = 20.