Evaluate
9-6n-n^{2}+6m-m^{2}
Differentiate w.r.t. m
6-2m
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m^{2}+6m+9-2m^{2}-n^{2}-6n
Multiply m and m to get m^{2}.
-m^{2}+6m+9-n^{2}-6n
Combine m^{2} and -2m^{2} to get -m^{2}.
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