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[" 13.In "/ABC" ,the bisector of "/B" me...

[" 13.In "/_ABC" ,the bisector of "/_B" meets "AC" at "D" ."],[" A line "PQ|AC" meets "AB,BC" and "BD" at "P" ,"Q],[" and "R" respectively."],[" Show that "PR times BQ=QR times BP" ."]

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