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  3. let ? = arccos(-?3/2), thena) ? = 5?/6 and cos ? =

Let ? = arccos(-?3/2), thenA) ? = 5?/6 and cos ? = -(?3/2)B) ? =...

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Let ? = arccos(-?3/2), thenA) ? = 5?/6 and cos ? = -(?3/2)B) ? = -(7?/6) and cos ? = -(?3/2)C) ? = 7?/6 and cos ? = -(?3/2)D) ? = -5?/6 and cos ? = -(?3/2)

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