The equation is .
Apply derivative on each side with respect to .
.
Quotient rule of derivatives : .
Substitute in the above expression.
Substitute in above expression.
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in the above expression.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d1e1fa69b1481e3e91f1c838a1821c01.png\")
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in above expression.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d1b036deef9d248511f08ea40010876b.png\")
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.