The trigonometric function is .
From the diagram : opposite side = 1 and adjacent side = 4.
.
(Substitute the value)
(Simplify)
The exact value of is .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6f72ee480cd94c39b8207c3c1232ee5c.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fae971a42e9a01df8a98a8c581dae1f4.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0ae2e021cd8370e18f8a74793b975f47.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8d38b4a5b3677742545385b434dd3fac.png\")
(Substitute the value)![\"\"](\"/userfiles/image/steps_images/step2.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5170a7f60aa8aa4cdf66430dc41605f4.png\")
(Simplify)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9e4010d1cdf74ef3f276c145cf09b9bf.png\")
(Simplify)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7ba5b800bdc60392b1e7eaea0814e737.png\")
.