Question: What is the period of the function f(x) = 3cos(4x) within the domain of -π/2 to π/2?
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What is the median of a set of numbers if the sum of the first three numbers is 15, the sum of the last three numbers is 25, and there are seven numbers in total?
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Question: Find the radius of a circle if the equation of the circle's function is given by x^2 + y^2 = r^2.