If sin x + sin y +sin z=3 then what will be the value of cos x +cos y +cos z explain it

If sin x + sin y +sin z=3 then what will be the value of cos x +cos y

1.	If sin x + sin y +sin z=3 then what will be the value of cos x +cos y +cos z explain it
Answer» sin x + sin y +sin z=3 is possible only when sin x =sin y =sin z=1 so for it x=y=z must be 90 degree so cos x+cos y+cos z=0 as we know cos 90 =0