[" (III) "cos67^(@)24'cos7^(@)24^(@)" the "],[[" (Iv) "tan(B-C)+tan(C=A)+tan(A-B),],[" E "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)

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

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

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+tan B+tan C=

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

If A+C=B then tan A* tan B * tan C=

If tan A+tan B+tan C=tan A . tan B . tan then