Many people know this mnemonic for the determinant of a 3 Ã 3 matrix: first repeat the
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and then calculate this.
h1,1h2,2h3,3 + h1,2h2,3h3,1 + h1,3h2,1h3,2
-h3,1h2,2h1,3 - h3,2h2,3h1,1 - h3,3h2,1h1,2
(a) Check that this agrees with the formula given in the preamble to this section.
(b) Does it extend to other-sized determinants?
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