Math question: For a circle with its center at the origin, find the y-coordinate of a point on the circle if its x-coordinate is 4, and the radius is 5.
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Find the absolute extrema of f(x) = x^3 - 4x^2 + x on the interval [-1, 3].
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Question: What is the derivative of ∫₀ˣ(e^t + 1) dt with respect to x?