The limit expression is .
.
The denominator of the function should not be zero.
Therefore, the limit does not exist.
Limit does not exist; When , the denominator is .
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, the denominator is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fcd348ebf66f4047fc23f05f2c058874.png\")
.