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fgiga [73]
3 years ago
6

Y = 7ex, y = 7e−x, x = 1; about the y-axis

Mathematics
1 answer:
atroni [7]3 years ago
3 0
A "typical" cylindrical shell of wall thickness dx at x=x will have the length (in the y-direction) L = (e^x – e^-x). 

<span>Rotating this shell about the y-axis generates a volume dV = 2.π.x.L = 2.π.x.(e^x – e^-x).dx </span>

<span>Total volume V of all such cylindrical shells in the given range = 2.π.∫x.(e^x – e^-x).dx </span>

<span>= 4.π.[x.cosh(x) – sinh(x)] from 0 to 1. Now insert the limits and we obtain: </span>

<span>= 4.π.[1.543 – 1.175] = 4.624 cubic units</span>
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