What is the cofactor expansion method to finding the determinant?
Choose a column : the column number
The cofactor expansion formula (or Laplace's formula) for the
Note that the number
Maybe it looks like complicated, but it's easy to understand with an example. We want calculate
If we develop on the 2nd column, you get
To be efficient, you have to choose a line which has a lot of zeros : the sum will be very simple to calculate !
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