Math question: Find the median of the following set of numbers: 10, 15, 20, 25, 30
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What is the median of a set with 9 numbers if the sum of the first 4 numbers is 17, the sum of the next 3 numbers is 15, and the sum of the last 2 numbers is 11?
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What is the domain of the function f(x) = cos(2x) for x in radians?