The area enclosed by the curve , and -axis is revolved about the -axis to form a solid.
The volume of the solid formed can be expressed as . Find .
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let's rotate the shape 90 degrees, so it's easyer to work with.
y = ln ( x 3 ) ⇒ e 3 y = x
using ∫ a b A ( x ) d x = π ∫ a b f ( x ) 2 d x
π ∫ 0 1 e 3 2 y d y ⇒ 2 3 π ∫ 0 1 3 2 e 3 2 y d y
2 3 π e 3 2 y ∣ 0 1 ⇒ π 2 3 ( e 3 2 − 1 )
A B = 2 3 3 2 = 1