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Omni-MATH / The three points A, B, C form a triangle. AB=4, BC=5, AC=6. Let the angle…

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The three points A, B, C form a triangle. AB=4, BC=5, AC=6. Let the angle bisector of \angle A intersect side BC at D. Let the foot of the perpendicular from B to the angle bisector of \angle A be E. Let the line through E parallel to AC meet BC at F. Compute DF.

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