How to find the inverse of a 3 by 3 matrix (3 methods you need to know)

Learn how to find the inverse of a 3 by 3 matrix for your linear algebra class!
0:00 hello!
0:44 [A|I] ~ [I|A^-1)
11:10 A^-1 = 1/det(A)*adjugate(A)
19:35 shorter version of the 2nd way
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