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 $T=45^{\circ}$
$\sin 45^{\circ}=\cos 45^{\circ}= \frac{\sqrt 2}{2}$
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
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