Mine
public text v1 · immutable> C:=matrix(3,3,[1,0,0,0,1,0,0,0,1]);
[1 0 0]
[ ]
C := [0 1 0]
[ ]
[0 0 1]
> B:=inverse(transpose(matrix(3,3,[14,0,2,0,1,0,2,4,3])));
[3 -1]
[-- 0 --]
[38 19]
[ ]
[4 -28]
B := [-- 1 ---]
[19 19 ]
[ ]
[-1 7 ]
[-- 0 --]
[19 19]