How can tell the inverse of a matrice?


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The inverse of a square matrix (A), sometimes called a reciprocal matrix, is a matrix A^(-1), such that AA^(-1) = I, where I is the identity matrix. For a 2×2 matrixA=[a b; c d], the matrix inverse is: A^(-1) = 1/(|A|)[d -b; -c a](3) = 1/(ad-bc)[d -b; -c a].

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