Math question: "What is the factored form of the quadratic equation x^2 - 5x + 6 = 0?"
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What is the standard deviation of the set: 5, 7, 9, 11, 13?
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Question: Find the amplitude, period, and phase shift of the cosine function f(x) = cos x. Also, determine the maximum and minimum values of f(x) within one period.