Consider triangle ABC,the continues charges distribution lies on the side of BC with the linear charge density such as m,prove that the direction of electric force in the point A lies on the bisector of the viewing angle BAC
I think your assumpion is not right.why If we rotate the triangle around bisector by alfa=180 degrees, then rotation transforms riangle back into itself! It is true only for AB=AC!
Consider triangle ABC,the continues charges distribution lies on the side of BC with the linear charge density such as m,prove that the direction of electric force in the point A lies on the bisector of the viewing angle BAC