The vectors are , .
Product of the vectors is so the vectors are orthogonal.
The vectors are orthogonal.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"straight](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=975fb7a613f3f3afe3374aab0452164a.png\")
, ![\"straight](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=8953ff1a82897ad61e037c25bf83a483.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=62669c44242ebd6ad41bff3ecdf4751a.png\")
so the vectors are orthogonal.![\"\"](\"/userfiles/image/steps_images/solution.JPG\")