What is the value of f(x) = c, given that c is a constant value?
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Math question: In a circle, if the angle at the center is twice the angle at the circumference, find the measure of the angle at the circumference when the angle at the center is 50°.
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Math Question: What is the derivative of f(x) = 3x^2 + 5x^3 - 2x - 7?