Prove the questions :
`1-tan.(A)/(2)tan.(B)/(2) = (2c)/((a+b+c))`

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

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

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

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

In triangle ABC ,prove that the maximum value of tan(A)/(2)tan(B)/(2)tan(C)/(2)is(R)/(2s)

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

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

If 2b=a+c , then prove that 3tan.(A)/(2).tan.(C)/(2)=1 .

If A+B+C=pi, show that : tan.(A)/(2)tan.(B)/(2)+tan.(B)/(2)tan.(C)/(2)+tan.(C)/(2)tan.(A)/(2)=1 Hence deduce that : cot.(A)/(2)+cot.(B)/(2)+.cot.(C)/(2)=cot.(A)/(2).cot.(B)/(2)tan.(C)/(2) .