The expression is .
The negative exponent formula is .Where and any whole number n.
The solution is .
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.Where ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=42a566b19f0d56198585965f5a36766c.png\")
and any whole number n.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e980a4f9b40bb65a8a0112294e1b8cb1.png\")
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.