70. Viewing Angle of a Tower A 380-ft-tall building supports a 40-ft communications tower (see the figure). As a driver approaches the building, the viewing angle 8 of the tower changes. (a) Express the viewing angle 0 as a function of the distance x between the driver and the building. (b) At what distance from the building is the viewing angle 0 as large as possible? 40 ft 380 ft

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