Find the period of the function y = 2cos(3x) - sin(4x)
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What is the derivative of f(x) = sin(x) + cos(x) + exp(x) + ln(x) at x = π/4?
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Math question: For the cubic function f(x) = x^3, find the value of x at which the function attains its maximum or minimum value within the domain [-10,10].