Math question: What is the 5th derivative of f(x) = 2x^3 + 5x^2 - 3x + 4?
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Math question: In triangle ABC, angle bisector BD intersects side AC at point D. If angle ABD measures 60Β° and angle BAC measures 120Β°, what is the measure of angle ABC?
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What is the variance of the dataset: {2, 4, 6, 8}?