| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_4_023.html | Chapter 1. Calculus Tutorial 2.4.023
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_4_023_dlap.xml | DLAP questions | 4f79e424b11c0f143f000000 |