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

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

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

In a Delta A B C , prove that: ((b^2-c^2)/(a^2))sin2A+((c^2-a^2)/(b^2))sin2B+((a^2-b^2)/(c^2))sin2C=0

For any triangle ABC, prove that (b^2-c^2)/(a^2)sin2A+(c^2-a^2)/(b^2)sin2B+(a^2-b^2)/(c^2)sin2C=0

In any DeltaABC , prove that, (b^(2)-c^(2))/a^(2)sin2A+(c^(2)-a^(2))/b^(2)sin2B+(a^(2)-b^(2))/c^(2)sin2C=0 .

In any DeltaABC , prove that asin(A/2+B)=(b+c)sin""A/2

In DeltaABC , prove that: a^(2)sin2B+b^(2)sin2A =2 ab sinC

In any DeltaABC , prove that : a cos A + b cos B + c cos C = 2a sin B sin C

In DeltaABC , prove that: (b-c)^(2)cos^(2)A/2+(b+c)^(2)sin^(2)A/2=a^(2)

In a DeltaA B C prove that cos ((A+B)/2)=sin (C/2).