| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_5_013.html | Chapter 1. Calculus Tutorial 2.5.013
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_5_013_dlap.xml | DLAP questions | 4f7b424db11c0f5443000000 |