Inverse Matrix Calculator

This tool inverts a square matrix at two fixed sizes, 2 by 2 and 3 by 3, using the cofactor method. You type the entries row by row and it returns the determinant and the inverse, one row of the answer per line, rounded to six decimal places. A matrix whose determinant is zero has no inverse, and the tool says so rather than printing noise. Larger matrices and non-square matrices are not supported here.