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(s+d)(s2-sd+d2)
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DARLA011

by DARLA011 at June 03, 2010

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(s3-s2d+sd2)+(ds2-sd2+d3) = s3+d3

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yankeekid

yankeekid June 03, 2010

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=s3-s2d+sd2+s2d-sd2+d3=s3+d3

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gibby.

gibby. June 03, 2010