help

Are you guys good with Calculus? I'm trying to learn the shell method for finding volume and getting like 80% of it wrong. Pic related, how do you do this soykaf? Apparently the answer is 2pi/3 Yeah I know, I'm retarded, go back to kindergarten, etc etc. Seriously though how the hell do you do this

>>27043 Why is it 2pi leading and not just pi, i thought its just pi*r^2 and you plug in |f(x)^2-g(x)^2| for r^2

>>27045 >>27043 Sorry thats wrong. I missed that it was shell method. You need to change the integral to go from 0 to 1

>>27043 >>27045 why are you putting letters in the numbers? letters are for making words not for maths. thats probably why it doesnt work

>>27046 Ok thanks, that comes out right. Turns out I was looking at the wrong triangle. I don't even know where to start with this one. How do I get this thing in terms of y? >>27047 All the numbers are letters if you spell them out though

>>27049 jammit forgot picture