Answer
$\frac{1+\sqrt{3}}{2\sqrt2}$
Work Step by Step
Using the given identities and the known values: $\cos (\pi/12)=\pm\sqrt{\frac{1+\cos(\pi/6)}{2}}=\sqrt{\frac{1+(\frac{\sqrt3}{2})}{2}}=\frac{1+\sqrt{3}}{2\sqrt2}$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 14 Trigonometric Graphs, Identities, and Equations - Chapter Review - Page 968: 33
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
