The Gateway Arch in St. Louis (see the photo on page 543) was constructed using the

Chapter 8, Problem 42

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The Gateway Arch in St. Louis (see the photo on page 543) was constructed using the equation y 211.49 2 20.96 cosh 0.03291765x for the central curve of the arch, where x and y are measured in meters and | x | < 91.20. Set up an integral for the length of the arch and use your calculator to estimate the length correct to the nearest meter.

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