\
Step 1 :
\
The vectors are
and
.
\
\
The value of
is
\
Solution :
\
The value of
is
\
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=660850aa998923bb266c9e187d7aa822.png\")
and ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=005354724d5d3595e914445549d10c67.png\")
. and . ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0ac268570cd5815e695d58ca2161513d.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5b9217ced0dc6db2f75ad7ba4f0da61d.png\")
is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6d305e96745a78d9575f6e808cb9f1e1.png\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5b9217ced0dc6db2f75ad7ba4f0da61d.png\")
is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6d305e96745a78d9575f6e808cb9f1e1.png\")