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Proof: d/dx(ln x) = 1/x http://www.khanacademy.org/video/proof--d-dx-ln-x----1-x --------------------------------------------- (lnx)=1/x يتناول هذا الفيدو اثبات لمشتقة --------------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org