Cosine of angle A of the triangle ABC with vertices A(1, -1, 2), B(6, – McqOptions

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1.	Cosine of angle A of the triangle ABC with vertices A(1, -1, 2), B(6, 11, 2) and C(1, 2, 6) is
A.	30/65
B.	65/36
C.	36/65
D.	60/65
Answer» D. 60/65

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