Matrix inverse
The inverse of matrix M is denoted as 
. Multiplying a matrix by its inverse will result in the identity matrix. Not every matrix has an inverse. Only matrices with a non-zero determinant have an inverse. Finding the inverse of a matrix is one of the more expensive operations we are going to perform. However, not every matrix has an inverse! Only square matrices with a non-zero determinant have an inverse.
To find the inverse of a matrix, first find the inverse of its determinant
. If this scalar is zero, the matrix has no inverse. If ...
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