(iv)tan(B-c)+tan(c-A)+tan(A-B)

tan(B-C)+tan(C-A)+tan(A-B)=tan(B-C)tan(C-A)tan(A-B)

tan(B-C)+tan(C-A)+tan(A-B)=tan(B-C)tan(C-A)tan(A-B)

Prove that, tan (B - C) + tan (C -A ) + tan (A -B) = tan (B-C) tan (C-A) tan (A -B)

If A,B,C are angles of a triangle, prove that (tan (B+C)+tan(C+A)+tan(A+B))/(tan (pi-A)+tan(2pi-B)+tan(3pi-C))=1 .

If A + B + C = 180^(@) prove that: (i) "sin" (B+C-A) + "sin"(C+ A-B) + sin (A + B-C) = 4 sin A sin B sin C (ii) cos(- A+B+C) + cos (A - B + C) + cos (A + B - C) = 1 + 4 cos A cos B cos C (iii) "tan" (B+C - A) + tan (C+A-B) + tan (A + B-C) = tan (B+C - A) tan (C+ A - B) tan (A+B-C)

tan(a-B)=(a)/(b),tan(B-C)=(b)/(c) and tan(C-A)=(c)/(a) then a^(2)c+b^(2)a+c^(2)b=

If tan^(2) A + tan^(2)B+tan^(2)C -tan B tan c-tan C tan A-tan A tan B=0 then DeltaABC is

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