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Differentiate w.r.t. P
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\frac{6kg}{\frac{2kgp}{Pp}+\frac{4kgP}{Pp}}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of P and p is Pp. Multiply \frac{2kg}{P} times \frac{p}{p}. Multiply \frac{4kg}{p} times \frac{P}{P}.
\frac{6kg}{\frac{2kgp+4kgP}{Pp}}
Since \frac{2kgp}{Pp} and \frac{4kgP}{Pp} have the same denominator, add them by adding their numerators.
\frac{6kgPp}{2kgp+4kgP}
Divide 6kg by \frac{2kgp+4kgP}{Pp} by multiplying 6kg by the reciprocal of \frac{2kgp+4kgP}{Pp}.
\frac{6Pgkp}{2gk\left(p+2P\right)}
Factor the expressions that are not already factored.
\frac{3Pp}{p+2P}
Cancel out 2gk in both numerator and denominator.