What are the characteristics of the parabola function y = ax^2? How does the value of 'a' affect the shape, vertex, axis, and direction of opening of the parabola?
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Math Question: Find the absolute extrema of the function f(x) = x^3 - 3x^2 - 9x over the interval [-5, 5].
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Question: Find the maximum value of the cosine function f(x) = cos x between the interval x ∈ [0, π/2].