Find the angle between the diagonal of a cube of side length 5 and

the diagonal of one of its faces, so that the two diagonals have a

common vertex. The angle should be measured in radians. (Hint: we may

assume that

the cube is in the first octant, the origin is one of its vertices, and

both diagonals start at the origin.)

the diagonal of one of its faces, so that the two diagonals have a

common vertex. The angle should be measured in radians. (Hint: we may

assume that

the cube is in the first octant, the origin is one of its vertices, and

both diagonals start at the origin.)

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