What is the maximum value of the function f(x) = x^2 - 4x + 3 over the interval [-1, 5]?
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What is the amplitude, period, and range of the cosine function f(x) = cos x? How many x-intercepts does it have? Does it have vertical asymptotes? Why or why not?
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What is the vertex of the quadratic function f(x) = 2x^2 - 3x + 1?