Use sum, difference, product, or half-angle formulas to find the exact value of each expression. cos65 cos20

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Use sum, difference, product, or half-angle formulas to find the exact value of each expression.

cos65° cos20° + sin65° sin20°

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Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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Question Posted: Mar 09, 2019 09:55 AM

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Use sum, difference, product, or half-angle formulas to find the exact value of each expression. cos65 cos20

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Precalculus

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