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

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

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