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![[Post New]](/templates/default/images/icon_minipost_new.gif) 12 May 2008 14:16:35 IST
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nw let me give all u guys a good solution of this problem...
let x= (a)(b) + (-b)(a) +(-a)(-b)
= a(b-b) + (-a)(-b)
= 0 + (-a)(-b)
also x=ab + (-b)(a-a)
= ab +0.
so ab = (-a)(-b)
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