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![[Post New]](/templates/default/images/icon_minipost_new.gif) 12 Jun 2008 09:44:28 IST
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first of all you solve incorrectly the diff. of -1/x^2. it is 1/x^3.you just place right ans after solving roung.if you solve right then ans comes 1/x^3.
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this reply: 5 points
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