the whole is meant to be over 3
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You have . Start by expanding the brackets. You should be able to find the derivative term by term.
is it zero is excluded as 0 for a length (in the original question cannot make sense)
No, your expansion gives but you haven't differentiated it yet...
ok i really gotta practice with pi in these eqn's. for stat points v' = 0 therefore 0 doesnt make sense so 4 only?
Your calculations are correct. But it should be possible to say that if you don't have a radius you don't have a volume, so is definitely a minimum...
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