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c/(a-b)=(tan(A/2)+tan(B/2)/(tan(A/2)-tan...

`c/(a-b)=(tan(A/2)+tan(B/2)/(tan(A/2)-tan(B/2)`

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v) tan(A/2)tan(B/2)+tan(B/2)tan(C/2)+tan(C/2)tan(A/2)=1