Answer
In the definitions of the sine, cosine, secant, and cosecant functions, r is interpreted geometrically as the distance from a given point (x,y) on the terminal side of an angle \theta in standard position to the origin.
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 27: 2
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