Show that `Rr (sin A+sin B + sin C) =Delta`

If A + B + C = 180^@ , then prove that sin 2 A+ sin 2B + sin 2C = 4 sin A sin B sin C

sin x + sin 3x + sin 5x =0

Show that sqrt ((1+sin A ) /( 1-sin A))= sec A + tan A

sin 2 ………… sin 5

Is it right to say that sin (A+B) =sin A +sin B ? Justify your answer.

In a right angle triangle ABC, right angle is at B ,If tan A=sqrt(3) , then find the value of (i) sin A cos C+ cos A sin C " "(ii) cos A cos C -sin A sin C

If A +B + C = pi then secA (cos B cos C - sin B sin C) = .........

If in a triangle PQR; sin P, sin Q, sin R are in A.P; then

If A,B and C are the angle of a triangle show that (i) |{:(sin2A,sinC,sinB),(sinC,sin2B,sinA),(sinB,sinA,sin2C):}|=0. (ii) |{:(-1+CcosB,cosC+cosB,cosB),(cosC+cosA,-1+cosA,cosB),(-1+cosB,-1+cosA,-1):}|=0.