$\"\"$ \ \

\

Consider the vector are $\"\"$ and $\"\"$ .

\

Find $\"\"$ .

\

The cross product produce a vector orthogonal to both.

\

$\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$ \ \

\

Consider the vector are $\"\"$ and $\"\"$ .

\

The cross product produce a vector orthogonal to both.

\

Find $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$ .

\

Therefore, $\"\"$ .

\

$\"\"$

\

$\"\"$ .