Can anyone help me find a proof for this:

  • Thread starter Thread starter Dee
  • Start date Start date
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Dee

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http://img146.imageshack.us/my.php?image=90331386bk2.png?
go here i have the same question as him:
http://answers.yahoo.com/question/index;_ylt=Agd_VnLn1DrVHJbXXiAH84Psy6IX;_ylv=3?qid=20081129011106AApklCO
 
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