1.

Incircle of AABC touches the sides BC, AC, and AB at D, E, and F, respectively. Then answer the following questions: Area of DeltaDEF is

Answer»

`2R^(2) sin (2A)sin(2B) sin(2C)`
`2r^(2)"cos"(A)/(2)"cos"(B)/(2)"cos"(C)/(2)`
`2r^(2)sin(A-B)sin(B-C)sin(C-A)`
None of these

Answer :B


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