2(m+1)²-4m=2(m²+2m+1)-4m=2m²+4m+2-4m=2m²+2=2(m²+1)
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2(m+1)²-4m=2(m²+2m+1)-4m=2m²+4m+2-4m=2m²+2=2(m²+1)