[" v) "tan(B-C)+tan(C-A)+tan(A-B)],[qquad =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)

Tan (A-B) + Tan (B-C) + Tan (C-A)

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 are the angles of a triangle, show that, (iv) (tan(B + C) + tan (C + A) + tan (A + B))/(tan (pi - A) + tan(2pi - B) + tan (3pi - C)) = 1

tan A+tan B+tan C=

IF A+B+C =pi , then tan ((A)/(2)) tan ((B)/(2)) + tan (B/2) tan (C/2) + tan (C/2 ) tan ((A)/(2)) is