In any `Delta ABC`, prove that : `((a-b)/c) = (tan (A/2) - tan (B/2))/(tan (A/2) + tan (B/2)`

In any Delta ABC, prove that: (a+b-c)/(a+b+c)=tan((A)/(2))tan((B)/(2))

In DeltaABC , Prove that (s-a) tan (A/2)=(s-b) tan (B/2)=(s-c) tan (C/2)

If A+B+C=pi , prove that : tan( A/2) tan (B/2) + tan (B/2 )tan (C/2)+ tan( C/2) tan (A/2) =1

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

In any Delta ABC, prove that :1-tan((A)/(2))tan((B)/(2))=(2c)/(a+b+c)

In any triangle ABC, prove that following: (c)/(a-b)=(tan((A)/(2))+tan((B)/(2)))/(tan((A)/(2))-tan((B)/(2)))

In a Delta ABC prove that (tan(A+B))/(2)=(cot C)/(2)

In any Delta ABC, prove that :tan((A)/(2)+B)=(c+b)/(c-b)tan((A)/(2))

In any triangle ABC,prove that (a-b)/(a+b)=(tan((A-B)/(2)))/(tan((A+B)/(2)))

In a Delta ABC, prove that tan((A+B)/(2))=cot((c)/(2))