In the next lesson, you'll see that cos 2A = cos2A - sin2A is an identity. Use

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In the next lesson, you'll see that cos 2A = cos2A - sin2A is an identity. Use this identity and the identities from this lesson to prove that
a. cos 2A = 1 - 2 sin2 A
b. cos 2A = 2 cos2 A - 1

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Discovering Advanced Algebra An Investigative Approach

ISBN: 978-1559539845

1st edition

Authors: Jerald Murdock, Ellen Kamischke, Eric Kamischke

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Question Posted: May 17, 2016 07:14 AM

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In the next lesson, you'll see that cos 2A = cos2A - sin2A is an identity. Use

Question:

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Discovering Advanced Algebra An Investigative Approach

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