If you take the derivative of the area of a circle, you get the formula for circumference. When you take the derivative of the volume of the sphere, you do not get the formula for the area of a circle. Why not?(adsbygoogle = window.adsbygoogle || []).push({});

d/dr (4/3pi r^3) =4pi r^2

d/dr (pi r^2)= 2pi r

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# Dervative of volume of sphere?

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