Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 4 - Review Exercises - Page 183: 19

Answer

cosine

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 cosine function passes through the point $(\frac{\pi}{2}, 0)$.
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