Answer
$cos(0) =\boxed{1}$
Work Step by Step
We know that $cos(\theta) = \dfrac{base}{hypotenuse}$, but when $\theta = 0$, the base is equivalent to the hypotenuse, so $cos(0)= 1$.
Calculus: Early Transcendentals (2nd Edition)
by Briggs, Bill L.; Cochran, Lyle; Gillett, Bernard
Published by
Pearson
ISBN 10:
0321947347
ISBN 13:
978-0-32194-734-5
Chapter 1 - Functions - 1.4 Trigonometric Functions and Their Inverse - 1.4 Exercises - Page 48: 23
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