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Home > CALC > Chapter 7 > Lesson 7.3.3 > Problem 7-134


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

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

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

  2. Is your approximation an over or under estimate? Use the second derivative to justify your answer.

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