Expand
m^{2}-4mn-6m+4n^{2}+12n+9
Evaluate
\left(m-2n-3\right)^{2}
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m^{2}-4mn-6m+4n^{2}+12n+9
Square m-2n-3.
m^{2}-4mn-6m+4n^{2}+12n+9
Square m-2n-3.
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