Evaluate
36\left(mn\right)^{2}
Differentiate w.r.t. m
72mn^{2}
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6m^{2}n\times 3\times 2n
Multiply m and m to get m^{2}.
6m^{2}n^{2}\times 3\times 2
Multiply n and n to get n^{2}.
18m^{2}n^{2}\times 2
Multiply 6 and 3 to get 18.
36m^{2}n^{2}
Multiply 18 and 2 to get 36.
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