The inverse of a square matrix A is a second matrix such that AA-1 = A-1A = I, I being the identity matrix. There are many ways to compute the inverse, the most common being multiplying the reciprocal of the determinant of A by its adjoint (or adjugate, the transpose of the cofactor matrix). For example, This is indeed the inverse of A, as A matrix is invertable if and only if the determinant is not equal to zero.
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