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[" 18.X is a point on the side "BC" of "...

[" 18.X is a point on the side "BC" of "/_ABC.XM" and "XN" are drawn parallel to "AB" and "AC" respectively "],[" meeting "AB" in "N" and "AC" in "M.MN" produced meets "CB" produced at "T" .Prove that "TX^(2)=TB times TC" ."]

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