The trigonometric expression is .
Consider .
Apply quotient identity: .
.
The simplified expression is .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=42456fb629eeb0a5580e5d2c99fdaf12.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=42456fb629eeb0a5580e5d2c99fdaf12.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0650ceee0a73ac390e52a3b552b531f7.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d1a5081d8138d0138d96bca5ca9c7827.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d821237cbbf195730edcdf72a0b05185.png\")
.![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6143b68b02063a28e0b2db002f58cdd6.png\")
.