Evaluate
\frac{cmn}{20000}
Differentiate w.r.t. n
\frac{cm}{20000}
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\frac{\frac{1}{25}ncm}{800}
Divide 2n by 50 to get \frac{1}{25}n.
\frac{1}{20000}ncm
Divide \frac{1}{25}ncm by 800 to get \frac{1}{20000}ncm.
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