![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ac0079061eaaa0bbc0367e7965d6e060.png\")
.The function is .
Trigonometric even-odd identity : ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c2761c49020c7c8908221f93e2fc7765.png\")
.
Since ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c1dba92ad39fa7aa21a52c3f2d33fd75.png\")
, the cotangent function is an odd function.
Since the cotangent function is an odd function, its graph is symmetric with respect to the origin.
\ \The cotangent function is an odd function and it is symmetric with respect to the origin.