1.

Let a triangle ABC be inscribed in a circle of radius 2 units. If the 3 bisectors of the angles A, B and C are extended to cut the circle atA_(1), B_(1) and C_(1) respectively, then the value of[(A A_(1) "cos"(A)/(2)+ B B_(1) "cos"(B)/(2)+C C_(1) "cos"(C)/(2))/(sin a + sin B + sin C)]^(2)=

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4
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25
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Answer :B


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