What is the value of y when x=3 in the circle function x^2+y^2=9?
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What is the maximum value of the function f(x) = -x^2 + 6x - 8 on the interval [0, 5]?
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Question: What is the period of the cosine function f(x) = cos(x)? Is it possible for the cosine function to have a period greater than 2π? Justify your answer.(