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Calculate the dilution factor if the sample volume is 30 microliter and the diluent volume is 270 microliter? There is no more than the initial problem.? I need to solve for x (sin 2x - cos x) /(cos 2x + sin x -1) = sin (pi + x)? Does it ever rain all day in Florida? Prove if there is identity cos 2x / (1 + sin 2x) = (cot x - 1) / (cot x + 1)?