Answer
True
Work Step by Step
$\cos 70^{\circ} = 0.3420201433$
$\cos 35^{\circ}\times 2 = 2\cos^{2} 35^{\circ} -1 $
$\cos 70^{\circ} = 2\cos^{2} 35^{\circ} -1 = 1.3420201433 -1 = 0.3420201433 $
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 2 - Acute Angles and Right Triangles - Section 2.3 Finding Trigonometric Function Values Using a Calculator - 2.3 Exercises - Page 67: 54
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.
