The vectors are
and
.
The cross product produce a vector orthogonal to both.
\
.



.
.
The length of the vector
is
.
.
The unit vector is
.
.
.
Therefore, the unit vector is
.
The vectors are
and
.
.



.
.
The magnitude of the vector is
.
.
The unit vector is
.
.
.
Therefore, the unit vector is
.
The unit vectors are
and
.