The given function .
Differentiation the function with respect to on each side.
Product rule of differentiation .
.
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..![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8da2268e35b6b6daab9c47f71c4c8bf4.png\")
on each side.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5149bf20f6e98ac2e5d4173e0af5f8b9.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=76ce10ede87cc4b545fc04382e859e9e.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f18e3c3e57f35bf415d6b635b33cc1ab.png\")
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.