My calc class is studying basic derivatives, and I'm stuck on a problem.
The problem is f(r) = (4/3) * pi * r3 The answer is 4pir2
\dfrac{d}{dr}\, \left[\dfrac{4\pi r^3}{3}\right]
. . .=\, \dfrac{4\pi}{3}\, \cdot\, \dfrac{d}{dr}\left[r^3\right]
. . .=\, \dfrac{4\pi\, \cdot\, 3r^2}{3}
. ...