What is the maximum value of the function f(x) = x^3 - 6x^2 + 9x on the interval [-2, 4]?
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Question: What is the square root of 3/4 times the sum of square roots of 12 and 45 squared, divided by the square root of 13, rounded to two decimal places?
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Math question: Find the derivative of f(x) = 2x^3 - 5x^2 + 7x - 4.