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 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 28: 110

Answer

$T=45^{\circ}$

Work Step by Step

In the interval $0^{\circ}\leq T\leq90^{\circ}$, the sine and cosine functions have the same value when $T=45^{\circ}$ $\sin 45^{\circ}=\cos 45^{\circ}= \frac{\sqrt 2}{2}$

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