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\[x=\cos^{-1} (y/4)\]

ignore the mistake i made in the variables

Here is the problem I'm working at:

I think I'm using the cross-section method, but am not too sure on the radius.

Which I think would be (4-4sin(x)

Wait do you want 4sin(x) to equal 4?

I'm honestly not too sure on where to start with this problem.

Are you familiar with solids of rotation?

tbh no I know trig functions though but meh you should ask in chat for help

haha alright, thanks for the help

http://www.wolframalpha.com/input/?i=plot+y%3D4sin%28x%29

little bit (:
I am trying to find it

Sweet, thanks

what is the rotation axis?

it is y=4

so I'm thinking the radius is (4-4sin(x))

Any luck?

nope

\[V=\pi \int\limits_{0}^{2\pi}(4-4\sin x)^2dx\]