- The cost of living?

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Differentiate y=(1-cos2x/1+cos2x)^4? In an arithmetic progression, the sum of the first six terms is 261 and the sum of the first nine terms is 297. Find the first nine terms? Help on this chemistry/geometry question over significant figures? How to write in Visuall Basic:
Calculate the average MPG for a car.? How many quarts are in 2 cubic ft.?