Posted by Anonymous on Tuesday, March 31, 2009 at 9:22am.
how does pih^3/12 simplify to pih^2/4?
If you divide denominator by 3 you get 4 and then I guess the 3 goes away leaving a 2? But if this is correct why does this work?

trig/cal  bobpursley, Tuesday, March 31, 2009 at 9:39am
Did you do the antiderivative?
INT PI*H^2/4 dh = PI H^3/12
and likewise,
d/dh (PI H^3/12)= PI H^2/4 
trig/cal  Anonymous, Tuesday, March 31, 2009 at 9:49am
no i took the derivative. i see now
d/dh (PI*h^3/12) = 3PI*h^2/12 = PI*h^2/4
sorry i guess this was the wrong forum