The function is .
Rewrite the function as .
Apply derivative on each side.
Product rule of derivatives: .
Thus,
.
The Quotient Rule .
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. .![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ed45926e76fb7875986134dcaceb294f.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=76ce10ede87cc4b545fc04382e859e9e.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=478919e5bcc06af9ff8b21707a770689.png\")
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..