Question: When the catenary y = a cosh (x/a) is revolved about the x-axis, it sweeps out a surface of revolution called a catenoid. Find the

When the catenary y = a cosh (x/a) is revolved about 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 [-ln 2, ln 2] is rotated around the x-axis.

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