- 2sin^2(x)=2+cos(2x)?

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Find the volume of the solid obtained by rotating the region bounded by the curves: y=3x, y=6sqrtx; about y=12? Subtract the quotient of 8 divided by 7 from 9 is? A 305 liter/min of water flows through a pipe, what is the diameter of the pipe if the velocity of the water in the pipe is 7.3 m/s? Complete combustion of 8.70 g of a hydrocarbon produced 26.7 g of CO2 and 12.7 g of H2O. What is the empirical formula for the hydrocarbon? What are the whole numbers between 4 and 9?