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

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

s^(2)tan((A)/(2))tan((B)/(2))tan((C)/(2))

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

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

If the sides a,b,c are in A.P.prove that (tan)(A)/(2)+(tan)(c)/(2)=(2)/(3)(cot)(B)/(2)

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

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

In /_ABC with usual notations,if a,b,c are in A.P.then the numerical value of tan((A)/(2))tan((B)/(2))+tan((B)/(2))tan((C)/(2)) is

In Delta ABC if tan((A)/(2))tan((B)/(2))+tan((B)/(2))tan((C)/(2))=(2)/(3) then a+c