Let A = \left[ {\matrix{
{{1 \over {\sqrt {10} }}} & {{3 \over {\sqrt {10} }}} \cr
{{{ - 3} \over {\sqrt {10} }}} & {{1 \over {\sqrt {10} }}} \cr
} } \right] and B = \left[ {\matrix{
1 & { - i} \cr
0 & 1 \cr
} } \right], where . If , then the inverse of the matrix is