Let f be a nonnegative function such that ' is continuous over the interval [a, b]. Let
Question:
Let f be a nonnegative function such that ƒ'
is continuous over the interval [a, b]. Let S be the surface of
revolution formed by revolving the graph of ƒ, where
a ≤ x ≤ b, about the x-axis. Let x = u, y = ƒ(u) cos v, and
z = ƒ(u) sin v, where a ≤ u ≤ b and 0 ≤ v ≤ 2π. Then,
S is represented parametrically by r(u, v) = ui + ƒ(u) cos vj
+ ƒ(u) sin vk. Show that the following formulas are equivalent.
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