Answer
0
Work Step by Step
The terminal side of $90^{\circ}$ angle passes through (0,1). So $x=0,y=1$ and $r=1$.
$\cos 90^{\circ}=\frac{x}{r}=\frac{0}{1}=0$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - 5.2 Trigonometric Functions - 5.2 Exercises - Page 519: 51
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