`a sin(B-C)+b sin(C-A)+c sin (A-B)=0`
[संकेत `: a sin(B-C) k ( sin^(2)B -sin^(2)C)` इत्यादि ]

sin(B+C-A)+sin(C+A-B)+sin(A+B-C)=4sin A sin B sin C

(2sin (AC) cos C-sin (A-2C)) / (2sin (BC) cos C-sin (B-2C)) = (sin A) / (sin B)

(2sin (AC) cos C-sin (A-2C)) / (2sin (BC) cos C-sin (B-2C)) = (sin A) / (sin B)

If A + B + C =180^@ , prove that : sin (B + 2C) + sin (C + 2A) + sin (A + 2B) = 4 sin frac (B-C)(2) sin frac (C-A)(2) sin frac (A-B)(2) .

19. Prove that sin(A +B) sin(A-B)+sin(B+C)sin(B-C) + sin(C+A) sin(C-A)=0

Show that: sin A sin(B-C)+sin B sin(C-A)+sin C sin(A-B)=0

If in a DeltaABC, sin A: sin C = sin (A - B): sin (B-C), then a^(2), b^(2), c^(2) are in

If in a DeltaABC, sin A: sin C = sin (A - B): sin (B-C), then a^(2), b^(2), c^(2) are in

Prove that (a ^ (2) sin (BC)) / (sin B + sin C) + (b ^ (2) sin (CA)) / (sin C + sin A) + (c ^ (2) sin ( AB)) / (sin A + sin B) = 0