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A tetrahedron has vertices ABCD. Suppose that the plane y bisects the (internal) dihedral angle along edge AB and meets edge CD at G.

A tetrahedron has vertices ABCD. Suppose that the plane y bisects the (internal) dihedral angle along edge AB and meets edge CD at G. Prove that () (ABD) CG GD Notation: (ABC) denotes the area of triangle ABC.

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