Math question: Consider a circle with the equation x^2 + y^2 = r^2. If the radius, r, is 4 units, what are the possible values for the coordinates (x, y)?
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What is the maximum and minimum value of the function f(x) = 3x^2 - 4x + 5 on the interval [0, 1]?
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Math Question: Solve the cubic equation x^3 + 4x^2 + 4x - 3 = 0.