How does (2cos(theta))2 + (-2sin(theta))2 equal 4?

Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
Chapter6: Topics In Analytic Geometry
Section6.1: Lines
Problem 2ECP
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How does (2cos(theta))2 + (-2sin(theta))2 equal 4?

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