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A tetrahedron has vertices O(0, 0,0), A(...

A tetrahedron has vertices O(0, 0,0), A(1,2,1), C(2,1,3), D `(-1, 1,2)`. Show that the angle between the faces OAB and ABC is `cos^(-1) ((19)/(35))`.

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The correct Answer is:
`theta= cos^(-1) ((19)/(35))`
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