O is any point inside a triangle A B C ....

`O` is any point inside a triangle `A B C` . The bisector of `/_A O B ,/_B O C` and `/_C O A` meet the sides `A B ,B C` and `C A` in point `D ,E and F` respectively. Show that `A D * B E * C F=D B * E C * F A`

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