Question 976112
determinant = 1/ad-bc
=1/6

inverse is
-3 ===  0  *  1/6
6 ===  -2

-1/2==   0            INVERSE
-1  ===-1/3

         A ;; B  ;;;     D  ;;   -B
          C ;; D    ;;;  -C  ;;   A  , EACH OF THESE LATTER IS MULTIPLIED BY THE DETERMINANT 1/AD-BC IN THE ORIGINAL MATRIX.