The expression is .
The common denominator is , So .
(Product of two same sings is positive) \ \
The simplified expression is .
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, So ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b9cdbe41b2252889c59d329ad0d7598c.png\")
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(Product of two same sings is positive) \ \
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.