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Mathematics 7 Online
OpenStudy (anonymous):

Solve 2cos2Θ/2 = cos2Θ for 0º≤Θ≤360º ≈73.8º; 260.4º ≈225.7º; 315.8º ≈141.3º; 218.7º ≈51.7º; 138.2º

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