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Establish identity. cos( + k) = (-1)k cos , k any integer

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Establish identity.

cos(θ + kπ) = (-1)k cos θ, k any integer

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Related Book For  answer-question
Precalculus

Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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Question Details
Chapter # 7
Section: Section 7.5
Problem: 72
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Question Posted: March 09, 2019 07:59:43
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