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 anti-derivative?

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

## Answer This Question

## Related Questions

- math - what would the answer come out the be if you rationlized this equation: ...
- math - i got help with this problem a couple days ago. the answer and ...
- Math - Hi How do I add x/(x+1) + x^3? How do I divide those two numbers as well...
- Math...PLease Help Me... - Problem: 6-3x 25 ---- * ---- 5 4x-8 *I have to ...
- calculus - A hemispherical tank with a radius of 10m is filled from an input ...
- calculus (please help. URGENT!) - A hemispherical tank with a radius of 10m is ...
- Algebra - Simplify by removing the factor of 1 y^2-7y+6/ y^2+8y-9 I need to LCD...
- simplify - how do i simplify 10x^2y/-5x^4y Do you notice the y in both numerator...
- pre-cal - find the constant c such that the denominator will divide evenly into ...
- math - how do you solve 9x=6 9x=6 Divide both side by 9. (Remember you can add, ...

More Related Questions