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Expand : (a/2+b/3)^2...

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`(a/2+b/3)^2`

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`(a/2+b/3)^2`
= `(a/2)^2+2(a/2)xx(b/3)xx(b/3)^2`
=`a^2/4 +(ab)/3 +b^2/9`.
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