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Lesson Explainer: Three-by-Three Determinants | Nagwa

From the cofactors, for any fixed 𝑖 = 1 , 2 , or 3, the determinant of a 3 × 3 matrix 𝐴 is equal to d e t ( 𝐴 ) = 𝑎 𝐶 + 𝑎 𝐶 + 𝑎 𝐶 .

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