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OA, OB, OC are the sides of a rectangular parallelopiped whose diagonals are OO', AA' , BB' and CC' . D is the centre of the rectangle AC'O'B' and D' is the centre of the rectangle O'A'CB' . If the sides OA, OB , OC are in the ratio 1:2:3 , the angleangle DOD' is equal to |
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Answer» `COS^(-1) (24)/(sqrt697) ` |
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