Answer
sine
Work Step by Step
Among the six trigonometric functions, sine and cosine and their respective reciprocal functions, cosecant and secant, have a period of $2\pi$.
However, only the sine function passes through the origin.
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 4 - Review Exercises - Page 183: 18
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