Math question: What is the limit of the product of two functions f(x) and g(x) as x approaches a, given both limits exist?
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Math question: Find the 5th order derivative of f(x) = cos(2x) at x = π/4.
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What is the length of the side of a triangle if the angle opposite it measures 50 degrees, another side measures 10, and the opposite angle measures 40 degrees?