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7-145.

Write the equation of a line tangent to the graph of at .

  1. Use the tangent line to approximate the value of .

    Because is hard to evaluate, the tangent line at  will give a decent approximation of .

  2. Is your approximation an overestimate or an underestimate? Use the second derivative to justify your answer. Homework Help ✎

    and that will indicate if the tangent line is above or below the graph.