![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
Observe the graph :
\Consider the horizontal line ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a4f8c5730f9412f995989427f42e70fc.png\")
on the graph.
Horizontal line touches the graph more than once.
The function does not passes the horizontal test, hence the function is not an one-to-one function.
\Therefore the inverse of the function does not exist.
\![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
The inverse of the function does not exist.