\
The expression is
.
\
Let
then
.
\
.
\
has the same range as
.
\
Trigonometric ratio :
.
\
\
\
.
\
\
.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=881a076d4efae37a3d373ef4883dc531.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=91589373da64d10353ae5bc9bc143b89.png\")
then ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=18b2744f8c7940774fc3e529ea83dc50.png\")
. ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d05ebc9b035e414acd99b272e3ab6ca0.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ca4703ac0bde57ec73e59093e58630d6.png\")
has the same range as ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d26abfab6bbb3b25381e5a87d5697f16.png\")
. ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=08c5436fdf4c9738794555beb6c2b026.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3135ccd9305d2775fd56f2e2e86d5e4c.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6b33a693b29a5694da08cfc2bd7e0f78.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=19834b917ac1a221ae48049ac5b9f77a.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=19834b917ac1a221ae48049ac5b9f77a.png\")
.