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Sin/Cos derivative question

On page 5 of the textbook (this is the link to the textbook https://s3.amazonaws.com/saylordotorg-resources/wwwresources/site/wp-content/uploads/2012/12/MA005-3.2-Definition-of-Derivative.pdf) it says that"we calculated the second and fourth limits in section 1.2". Where in section 1.2 is it? I can’t seem to figure out how to do it.

The author says “the first and third limits do not depend on h, and we calculated the second and fourth limits in Section 1.2”

I carefully read section 1.2 The only vaguely related remark appears to be problem 13 (b) (b) Graphically and using your calculator, determine … I guess the author considers punching buttons on a calculator serves as calculating. That seems pretty off the wall. Anyway…