Answer
$\frac{23}{25}$
Work Step by Step
$\cos^{2}\theta= 1-\sin^{2}\theta=1-\frac{1}{25}=\frac{24}{25}$
$\cos 2\theta=\cos^{2}\theta-\sin^{2}\theta=\frac{24}{25}-\frac{1}{25}=\frac{23}{25}$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 1 - Precalculus Review - 1.4 Trigonometric Functions - Exercises - Page 30: 23
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