-8(m-n)²+2(3m+2n)²

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-8(m-n)²+2(3m+2n)²-8(m-n)²+2(3m+2n)²-8(m-n)²+2(3m+2n)² 

-8(m-n)²+2(3m+2n)²
-8(m-n)²+2(3m+2n)²

-8(m-n)²+2(3m+2n)²