Question: Let f(x) = e^-x and Da = {(x, y) : 0 en-x and O < x < a, f(a) < y < f(x)}. Find the

Let f(x) = e^-x and Da = {(x, y) : 0

en-x and O < x < a, f(a) < y < f(x)}. Find the volume of the Solid obtained by rotatingP. about the y-axis. Hence conclude that the volume of the infinite objectobtained by around the y-axis is finite.

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