If `cosA + cosB + cosC = 0 sinA + sinB + sinC = 0 A + B + C = pi` then `sin3A + sin3B + sin 3C =`

If cosA+cosB=m and sinA+sinB=n then sin(A+B)=

If A+B+C=pi , prove that : sinA cosB cosC +sinB cosC cosA + sinC cosA cosB = sinA sinB sinC .

If cosA+cosB+cosC=0,sinA+sinB+sinC=0andA+B+C=180^(@) then the value of cos3A+cos3B+cos3C is :

If A + B + C = 180 ^ @ then (sin 2A + sin 2B + sin 2C) / (cosA + cosB + cosC - 1) =

In Delta ABC, if (Sin A + SinB + SinC) (SinA + SinB - SinC) = 3SinA SinB then C =

Statement I: If sinA=sinB , cosA=cosB then A= 2np + B Statement II :If A+B+C=90^@ then sin2A+sin2B + sin2C = 4 sinA sinB sinC Which of the above statements is correct?

If A+B+C= pi/2 , show that : sin^2 A + sin^2 B + sin^2 C=1-2 sinA sinB sinC

If A+B+C=pi , prove that : sin (B+C-A) + sin (C+A-B) + sin (A+B-C)=4sinA sinB sinC

If sinA+cosB=a and sinB+cosA=b then sin(A+B)=