" 3.If "b+c=2a," show that,"2sin(A)/(2)=sin(B+(A)/(2))

In any triangle ABC, show that: 2a sin((B)/(2))sin((C)/(2))=(b+c-a)sin((A)/(2))

If A + B + C = pi , then show that sin (A + B + C)/( 2) = sin(A / 2) * cos "" (B + C)/( 2) + sin "" (B + C)/( 2) * cos "" (A) / (2)

In any triangle ABC, show that : 2a sin (B/2) sin (C/2)=(b+c-a) sin (A/2)

If A+B+C = 2pi , show that sin^(3)A+sin^(3)B + sin^(3)C = 3sin A/2* sin B/2* sin C/2 - sin3A/2*sin 3B/2 * sin3C/2

Show that cos[(B-C)/2]=(b+c)/a sin(A/2)

If the sides a , b and c of A B C are in AdotPdot, prove that 2sin(A/2)sin(C/2)=sin(B/2)

In a DeltaABC" show that "(b^(2)-c^(2))/(a^(2))=(sin(B-C))/(sin(B+C))

In triangleABC,A+B+C=pi ,show that sin^2( A/2)+sin^2 (B/2)-sin^2 (C/2)=1-2cos(A/2)cos(B/2)sin(C/2)

If tan (A+B) = 3 tan A , "show that" sin (2A +2B) + sin 2A = 2 sin 2 B

If A, B, C are interior angle of triangle ABC then show that sin ((A+B)/2) + cos (( A+ B)/2) = cos (C/2) + sin (C/2)