Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 14 Trigonometric Graphs, Identities, and Equations - 14.6 Apply Sum and Difference Formulas - Guided Practice for Examples 1 and 2 - Page 950: 2



Work Step by Step

Using the given formula and the known values: $\cos75^\circ=\cos30^\circ\cos45^\circ-\sin30^\circ\sin45^\circ=\frac{\sqrt3}{2}\frac{1}{\sqrt2}-\frac{1}{2}\frac{1}{\sqrt2}=\frac{\sqrt3-1}{2\sqrt2}$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After 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.