1.
If AA, BB, and (adj(A1)+adj(B1))\bigl(\text{adj}(A^{-1}) + \text{adj}(B^{-1})\bigr) are non-singular matrices of the same order, then the inverse of A(adj(A1)+adj(B1))1BA\bigl(\text{adj}(A^{-1}) + \text{adj}(B^{-1})\bigr)^{-1}B is equal to: