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  1. mathematics
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  3. let ? = arccos (-1/2), then? = -4?/3 and cos? = -1

Let ? = arccos (-1/2), then? = -4?/3 and cos? = -1/2? = 2?/3 and...

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Let ? = arccos (-1/2), then? = -4?/3 and cos? = -1/2? = 2?/3 and cos? = -1/2? = 4?/3 and cos? = -(1/2)? = -(2?/3) and cos? = -1/2

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