Observe the graph:
The graph is of the line .
Apply tangent on each side.
.
The graph has a rectangular equation and a polar equation .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f8cde61131d90c4b9a25008525df8c86.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=38adae1a02aa9e715b573d1a8b7566af.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ad13526c97516f9e9e14441d290a1b96.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=01f18dd9efbb98793d4232438c68597c.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2c02a5be31af364f9afd7338aaee2434.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2c02a5be31af364f9afd7338aaee2434.png\")
and a polar equation ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f8cde61131d90c4b9a25008525df8c86.png\")
.![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
and a polar equation .