Posted by Riley on Wednesday, April 22, 2009 at 10:28am.
V(h) = pie/3(R^2hh^3)
take the derivative with respect to h.
using the chain rule I got:
V'(h) = pie/3(2Rh+R^23h^2)
but this is not the correct answer. what did I do wrong?

calculus  drwls, Wednesday, April 22, 2009 at 10:37am
I would prefer to write the V equation as
V(h) = (pi/3)(R^2*hh^3)
to emphasize that the (R^2hh^3)
term is not in the denominator.
Unless R is a function of h, you do not have to use the chain rule. You have said nothing that implies that R is a function of h. R and h are independent variables. ÝV/Ýh is really a partial derivative.
Consider R as a constant when differentiating with respect to h.
V'(h) = (pi/3)R^2  pi*h^2

calculus  drwls, Wednesday, April 22, 2009 at 10:39am
Ignore ÝV/Ýh
Jiskha would not allow me to type the roundedd symbol for d in the partial derivative.

calculus  Riley, Wednesday, April 22, 2009 at 10:44am
thanks!
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