Math question: Find the absolute extrema of the function f(x) = x^2 - 4x + 3 on the interval [1, 5].
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Math question: In a circle, if an angle at the center is twice the size of an angle at the circumference, and the angle at the circumference measures 60 degrees, what is the measure of the angle at the center?
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Math Question: Find the derivative of f(x) = 3x^5 - 2x^3 + 4x^2 - 7x + 9.