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  3. let ? = arccos(1/2), thena) ? = ?/3 and cos ? =1/2

Let ? = arccos(1/2), thenA) ? = ?/3 and cos ? =1/2B) ? = -(?/3)...

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Let ? = arccos(1/2), thenA) ? = ?/3 and cos ? =1/2B) ? = -(?/3) and cos ? = 1/2C) ? = 5?/3 and cos ? = 1/2D) ? = -5?/3 and cos ? = 1/2

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