Evaluate
n+\frac{\pi }{p}
Differentiate w.r.t. n
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\frac{np}{p}+\frac{\pi }{p}
To add or subtract expressions, expand them to make their denominators the same. Multiply n times \frac{p}{p}.
\frac{np+\pi }{p}
Since \frac{np}{p} and \frac{\pi }{p} have the same denominator, add them by adding their numerators.
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