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

In any DeltaABC , prove that (sin B)/(sin(B+C) ) = b/a

In DeltaABC , prove that: (a+b+c).(tan(A/2)+tan(B/2))=2c cot(C/2)

In any DeltaABC , prove that (a+b-c) cot (B/2) = (a-b+c) cot (C/2)

In any DeltaABC , prove that : (b-c)/a cos^2 (A/2) + (c-a)/b cos^2 (B/2) + (a-b)/c cos^2 (C/2) = 0

In any DeltaABC , prove that ((b-c))/((b+c))=(tan""(1)/(2)(B-C))/(tan""(1)/(2)(B+C))

In any DeltaABC , prove that (a-b)/(a+b)=(tan""1/2(A-B))/(tan""1/2(A+B))

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

i) In DeltaABC , prove that: (b-a)/(b+a)=tanC/2. tan(B-A)/(2) ii) In DeltaABC , prove that: asin(A/2+B) = (b+c)sinA/2