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[" A-12.24In a scalene triangle "ABC" ."...

[" A-12.24In a scalene triangle "ABC" ."D" is a point on the side "AB" such that "CD^(@)=AD.DB" ,if "sin A*sin B=sin^(2)(C)/(2)],[" then prove that "CD" is internal bisector of "/_C" ."]

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