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In a DeltaA B C ,1/(1+tan^2(A/2))+1/(1+t...

In a `DeltaA B C ,1/(1+tan^2(A/2))+1/(1+tan^2(B/2))+1/(1+tan^2(C/2))`=`k [1+sin(A/2) sin(B/2) sin(C/2)],` then the value of `k` is

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