Question: Graph the parabola f(x) = x 2 . Explain why the secant lines between the points (-a, f(-a)) and (a, f(a)) have zero slope. What

Graph the parabola f(x) = x². Explain why the secant lines between the points (-a, f(-a)) and (a, f(a)) have zero slope. What is the slope of the tangent line at x = 0?

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