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Type: Open-Ended
Category: Trigonometry
Level: Grade 12
Standards: HSF-TF.C.9
Author: nsharp1
Created: 4 years ago

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Grade 12 Trigonometry CCSS: HSF-TF.C.9

Given that

$cos(2theta) = cos^2(theta)- sin^2(theta)$ , prove that

$cos(2theta) = 2cos^2(theta)-1$ .