Set up and evaluate the definite integral for the area of the surface generated by revolving the curve about the x axis.
Now, to find the derivative is easy.
Not sure why the solution manual shows a - instead of a plus!
Anyways, at this point we have the form
which i can follow along with..
What is going on here? because if i squared everything i would get
no ... you're forgetting the middle term
However, the next step i dont see how the solutions manual got it..?
and why are they attaching y prime on the end? you dont need to explain the 2 pi