![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
The function is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=116aecdfc172782dbd6fb63030f89c4a.png\")
.
Apply derivative on both sides with respect to ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8da2268e35b6b6daab9c47f71c4c8bf4.png\")
.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=881de16520cb56f542facfbed6a2a40f.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=435439d1ce4515a7452c2ef1a0327473.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5c007b4f9addb2b80cd206a11902b36e.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4a487fbaf71d1676ee0f7ecffd2f2b48.png\")
.
![\"\"](\"/userfiles/image/steps_images/step2.JPG\")
The slope of the horizontal tangent is 0.
\Evaluate ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=56c6d8cf2a91f294bed1ab808b961c84.png\")
.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=42a0c0974c34b67d4fe57cddec70b96e.png\")
The values of ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8da2268e35b6b6daab9c47f71c4c8bf4.png\")
are imaginary, hence they are not considered.
There are no horizontal tangent lines.
\![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
There are no horizontal tangent lines.