TryInverse

The matrix that undoes this one, or Null for one with no inverse, whose determinant is 0. The inverse's rows are the cross products of the other two columns, over the determinant, worked out in Doubles, so a matrix of a tiny or huge scale inverts too.

The matrix that undoes this one, or Null for one with no inverse, whose determinant is 0: the cofactors over the determinant, by the minors of the first two columns and the last two, as Geometric Tools expands them, in Doubles, so a matrix of a tiny or huge scale inverts too.