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

Let A(3,0,-1) ,B(2,10,6) and C(1,2,1) be the vertices of a triangle and M be the mid- point of AC.
If G divides BM in the ratio `2:1` then cos `( angle GOA)` (O being the origin) is equal to

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