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     EduGorilla 
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    Directions: The vertices of a triangle ABC are A(2, 3, 1), B(- 2, 2, 0) and C(0, 1, – 1).

    What is the cosine of angle ABC?

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Reply To: Directions: The vertices of a triangle ABC are A(2, 3, 1), B(- 2, 2, 0) and C(0, 1, – 1).What is the….
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