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Could someone please explain to me what property was used in simplifying this, or how this was achieved?

enter image description here

Thank you.

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Expand the determinant by the last row. – Davide Giraudo Jun 1 '11 at 22:23
up vote 3 down vote accepted

This property:

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hehe I love this place. Thanks. – chaver Jun 1 '11 at 22:26
Aka as Laplace or cofactor expansion. – lhf Jun 1 '11 at 22:27

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