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[" Internal bisector of "/_A" of triangle "ABC" meets side "BC" at D.A line drawn through "D" perpendicular "],[" to AD intersects the side "AC" at "E" and the side "AB" at "F" .If "a,b" ,orepresent sides of "/_ABC" then "],[[" (A) "AE" is HM of "b" and "c," (B) "AD=(2bc)/(b+c)cos(A)/(2)],[" (C) "EF=(4bc)/(b+c)sin(A)/(2)," (D) the triangle AEF is isosceles "]]

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