The expression is .
(product of two same sings is positive) \ \
The common denominator is , So .
The simplified expression is .
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.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=656337c35a6410c5956f5d3feec15d8e.png\")
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(product of two same sings is positive) \ \
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, So ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=37f287617788c59631de9f4cd68fe3d1.png\")
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.