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    Stuck on a derivative problem! (d/dr)[(4 pi r^3)/3] = 4 pi r^2

    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} . ...
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