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

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

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

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

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

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

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) = (tan (A/2) - tan (B/2))/(tan (A/2) + tan (B/2)

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