Advanced math/trig. Chastity Reynolds. What is trigonometry?. Trigonometry is “the branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles, and the calculations based on them.” (“Trigonometry”). When/where did trig originate?.
"Trigonometry Functions - Introduction." Introduction to the 6 Trigonometry Functions. N.p., n.d. Web. 04 Sept. 2012. <http://www.mathopenref.com/trigfunctions.html>.