| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_8_005.html | Chapter 1. Calculus Tutorial 2.8.005.
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_8_005_dlap.xml | DLAP questions | 4f89c1f5b11c0fbb70000000 |