## anonymous 3 years ago i need help in this question..i'm going to attach the problem.

1. anonymous

here it is!:)

2. anonymous

You can integrate using Integration by washer/shells. Do you know how to do it?

3. anonymous

no, i dont.

4. anonymous

Imagine slicing it into a million pieces. The idea is that surface area of one slice and add it from 0 to pi/3 The formula is $\int\limits_{0}^{\pi/3} \pi (secx)^2- \pi (e^-x)^2 dx$

5. anonymous

doesnt it involve $V=\Pi \int\limits_{\Pi}^{0} f(x)$

6. anonymous

is it the same?

7. anonymous

Yea, its similiar

8. anonymous

ok, i think i know how to do it, i'll try it out and see what i get.

9. anonymous

ok :D

10. anonymous

ok i got this... V=$\Pi[\tan \Pi/3+(e^-2(\Pi/3))/2]-\Pi[\tan0+(1/2)]$

11. anonymous

Yea, that should be right