Write a math question for the theme "Characteristics of cosine function f(x) = cos x":What is the amplitude, period, and domain of the function f(x) = cos(x)? How many x-intercepts does it have?
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Math question: What is the 5th order derivative of f(x) = 3x^4 + 2x^3 - x^2 + 7x - 5?
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What is one of the characteristics of the ellipse function when the sum of the squares of the focal radii is greater than the square of the major axis length?