If `cosA+cosB+cosC=0`,`sinA + sinB + sinC=0`and `A+B+C=180^0`, then the value of `cos3A + cos3B + cos3C` is

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

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

If cos A+cos B+cos C=0sin A+sin B+sin C=0 and A+B+C=180^(@), then the value of cos3A+cos3B+cos3C is

If sinA+sinB+sinC=3 , then the value of cosA+cosB+cosC is equal to

If cosA+cosB+cosC=0=sinA+sinB+sinC then cos^(2)((A-B)/2)=

cosA+cosB+cosC=1+4sinA/2sinB/2sinC/2,ifA , B , C are the angles of a triangle.

if sinA +sinB=C and cosA+cosB=D and C , D!=0 then the value of sin(A+B) is equal to

Suppose A and B are two angles such that A,B in(0,pi) and satisfy sinA + sinB = 1 and cosA + cosB = 0. Then the value of 12cos2A + 4cos2B is _______