Answer
$ \frac{1}{4}$
Work Step by Step
$C=\frac{1}{4}cos(2x)-\frac{1}{2}cos^2(x)=\frac{1}{4}(2cos^2(x)-1-2cos^2(x))=\frac{1}{4}$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Analytic Trigonometry - 7.6 Double-angle and Half-angle Formulas - 7.6 Assess Your Understanding - Page 499: 106
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