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Let AD, BE, CF be the lengths of interna...

Let AD, BE, CF be the lengths of internal bisectors of angles A, B, C respectively of triangle ABC. Then the harmonic mean of `AD"sec"(A)/(2),BE"sec"(B)/(2),CF"sec"(C )/(2)` is equal to :

A

Harmonic mean of sides of `DeltaABC`

B

Geometric mean of sides of `DeltaABC`

C

Arithmetic mean of sides of `DeltaABC`

D

Sum of reciprocals of the sides of `DeltaABC`

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