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Determine the cos of the angles of the triangle whose vertices are.

Determine the cos of the angles of the triangle whose vertices are...
a) (2,-1,1), (1,-3,-5), (3,-4,-4)
b) (3,1,1), (-1,2,1), (2,-2,5)

asked Oct 2, 2018 in ALGEBRA 2 by anonymous
reshown Oct 2, 2018 by bradely

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