TS EAMCET 10-Sep-2020 Shift 1 Solved Paper
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Question : 61 of 160
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A tetrahedron has vertices O(0, 0, 0), A(l, 2, 1), B(2, 1, 3), C(-1, 1, 2). If θ is the angle between the faces OAB and ABC, then cos θ =
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