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[" D "],[" 11."ABC" is a triangle.The bi...

[" D "],[" 11."ABC" is a triangle.The bisector of the exterior angle at "B" and the bisector "],[" intersect each other at "D" .Prove that "/_D=(1)/(2)/_A" ."],[qquad AN" is the bisector of "/_A" .If "/_B=65^(@)]

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