| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_1_007.html | Chapter 1. Calculus Tutorial 2.1.007
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_1_007_dlap.xml | DLAP questions | 4edd4b03b11c0fed28000000 |