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[" Let "A(3,0,-1),B(2,10,6)" and "C(1,2,...

[" Let "A(3,0,-1),B(2,10,6)" and "C(1,2,1)" be the vertices "],[" of a triangle and "M" be the midpoint of "AC" .If G "],[" divides "BM" in the ratio,"2:1" ,then "cos(/_GOA)" ( "0],[" being the origin) is equal to : "]

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