Chapter 6
The Trig Tango
IN THIS CHAPTER
Socking it to ’em with SohCahToa
Everybody’s got an angle: 
, 
, 
Circumnavigating the unit circle
Graphing trig functions
Investigating inverse trig functions
Believe it or not, trigonometry is a very practical, real-world branch of mathematics, because it involves the measurement of lengths and angles. Surveyors use it when surveying property, making topographical maps, and so on. The Ancient Greeks and Alexandrians, among others, knew not only simple SohCahToa stuff, but a lot of sophisticated trig as well. They used it for building, navigation, and astronomy. Trigonometry comes up a lot in the study of calculus, so if you snoozed through high ...
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