#### 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 $

Published by
Pearson

ISBN 10:
0321671775

ISBN 13:
978-0-32167-177-6

True

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