In the next lesson, you'll see that cos 2A = cos2A - sin2A is an identity. Use
Question:
a. cos 2A = 1 - 2 sin2 A
b. cos 2A = 2 cos2 A - 1
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Related Book For
Discovering Advanced Algebra An Investigative Approach
ISBN: 978-1559539845
1st edition
Authors: Jerald Murdock, Ellen Kamischke, Eric Kamischke
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