Establish identity. cos( - ) cos( + ) = cos 2 - sin 2

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Establish identity.

cos(α - β) cos(α + β) = cos² α - sin² β

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Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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Question Posted: Mar 09, 2019 07:59 AM

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Establish identity. cos( - ) cos( + ) = cos 2 - sin 2

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Precalculus

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