2.8
http://tutorial.math.lamar.edu/Classes/CalcI/DefnOfDerivative.aspx

3.1
http://tutorial.math.lamar.edu/Classes/CalcI/DiffFormulas.aspx
http://tutorial.math.lamar.edu/Classes/CalcI/DiffExpLogFcns.aspx

3.2
http://tutorial.math.lamar.edu/Classes/CalcI/ProductQuotientRule.aspx

3.3
http://tutorial.math.lamar.edu/Classes/CalcI/DiffTrigFcns.aspx

3.4
http://tutorial.math.lamar.edu/Classes/CalcI/ChainRule.aspx

3.5
http://tutorial.math.lamar.edu/Classes/CalcI/ImplicitDiff.aspx

3.6
http://tutorial.math.lamar.edu/Classes/CalcI/DiffExpLogFcns.aspx (same as 3.1)

3.7
http://tutorial.math.lamar.edu/Classes/CalcI/RateOfChange.aspx

3.9
http://tutorial.math.lamar.edu/Classes/CalcI/RelatedRates.aspx