" een a diagonal of a cube and the diagonal of a face of the cube is "

In a unit cube. Find The angle between a diagonal of a cube and the diagonal of a face of the cube

The angle between diagonal of a cube and diagonal of a face of the cube will be

The angle between diagonal of a cube and diagonal of a face of the cube will be

What is the angle between the diagonal of one of the faces of the cube and the diagonal of the cube intersecting the diagonal of the face of the cube?

Prove the angle between the diagonal of one of the faces of the cube and the diagonal of the cube intersecting the diagonal of the face of the cube is cos^(-1)"sqrt(2/3)