Question: When the catenary y = acosh ( x a ) is revolved around the x - axis, it sweeps out a surface of revolution called

When the catenary y=acosh(xa) is revolved around the x-axis, it sweeps out a surface of revolution called a catenoid. Find the area of the surface generated when y= cosh x on [-ln12,ln12 is rotated around the x-axis.
The area of the surface is
(Type an exact answer.)
When the catenary y = acosh ( x a ) is revolved

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