Find the exact value of expression. cos 70 cos 20 - sin 70 sin 20

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Find the exact value of expression.

cos 70° cos 20° - sin 70° sin 20°

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Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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Question Posted: Mar 09, 2019 07:54 AM

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Find the exact value of expression. cos 70 cos 20 - sin 70 sin 20

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cos 70 cos 20 sin 70 s...View the full answer

Precalculus

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