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In triangle ABC, summation of (r+r1)tan(B-C/2)= A)ABC/∆^3 B)0 C)4Rr^2 D)1

In triangle ABC, summation of (r+r1)tan(B-C/2)= A)ABC/∆^3 B)0 C)4Rr^2 D)1/r

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