Math question: Find the derivative of f(x) = 5x^3 - 2x^2 + 8x - 4.
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Question: Convert 75 miles per hour (mph) to kilometers per hour (km/h).
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What are the values of x (in radians) for which the cotangent function f(x) = cot x has a period of Ο, a vertical asymptote at x = 0, and a horizontal asymptote at y = 0?