1 1 元 Find the area of the surface generated by revolving the curve x= cos (2t), y=6+ sin (2t) on 0 sts. about the x-axis. 2 2 1 1 Π The area of the surface generated by revolving the curve x = (Type an exact answer in terms of л.) (2t), y 6+ sin (2t) on 0sts. is square units. 2 A vertical cross section of a tank is shown. Assume that the tank is 14 feet long and full of water (8= 62.4 pounds per cubic foot), and that the water is to be pumped to a height 7 feet above the top of the tank. Find the work done in emptying the tank. The work done in emptying the tank is 43680 foot-lbs. (Round to the nearest whole number as needed.) 5 ft 7 ft