The trigonometric function is .
(Write interval of angle, )
(Divide each side by 2)
So, the angle , lies in quadrant I .
The angle , lies in quadrant I.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d047b09c81432b856ae4b903ccd023ad.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ebf34ecf005fb0624cfb7af634287540.png\")
(Write interval of angle, ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=897f9a2d5195c65b81fc063b542db9d9.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=795ed3e8bfb95d5a89c48877df11f69a.png\")
(Divide each side by 2)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4cf21bdfbf024f1203f638603cfd7687.png\")
lies in quadrant I ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=97678e77ea1f915bed9e2f6c94448d6a.png\")
.![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4cf21bdfbf024f1203f638603cfd7687.png\")
lies in quadrant I.