1.

Internal bisectors of DeltaABC meet the circumcircle at points D, E and F then Length of side EF is

Answer»

`2R"COS"(A)/(2)`
`2Rsin((A)/(2))`
`2R cos ((C)/(2))`
`2R cos((B)/(2))cos ((C)/(2))`

Answer :A


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