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5:28 - definitions: minors and cofactors 9:06 - example of finding cofactors 22:27 - theorem for finding determinants using cofactor expansion Support Wizards on Patreon - https://www.patreon.com/user?u=30765401&fan_landing=true ... https://www.youtube.com/watch?v=UKyf5tJOau4
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