Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 2 - Acute Angles and Right Triangles - Section 2.3 Finding Trigonometric Function Values Using a Calculator - 2.3 Exercises: 50

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 $
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