A) AE is HM of b and c
B) \[AD=\frac{2\,\,bc}{b+c}\,\,\cos \,\,\frac{A}{2}\]
C) \[EF=\frac{4\,\,bc}{b+c}\,\,\sin \,\,\frac{A}{2}\]
D) The triangle AEF is isosceles
E) All of these
Correct Answer: E
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