Differentiate w.r.t. m
160m
Evaluate
80m^{2}
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2\times 80m^{2-1}
The derivative of ax^{n} is nax^{n-1}.
160m^{2-1}
Multiply 2 times 80.
160m^{1}
Subtract 1 from 2.
160m
For any term t, t^{1}=t.
80m^{2}
Divide 4000 by 50 to get 80.
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