Answer
$\cos 90^{\circ}= 0$
Work Step by Step
1. We know about 90 degree angle
$\theta=90^{\circ}$
$x=0$
$y=1$
$r=1$
2. Substitute in:
$\cos\theta=\frac{x}{r}=\frac{0}{1}=0$
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 27: 57
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