From a point O inside a triangle A B C ,...

From a point `O` inside a triangle `A B C ,` perpendiculars `O D ,O Ea n dOf` are drawn to rthe sides `B C ,C Aa n dA B ,` respecrtively. Prove that the perpendiculars from `A ,B ,a n dC` to the sides `E F ,F Da n dD E` are concurrent.

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