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If x ,\ y ,\ z in [-1,1] such that cos^(...

If `x ,\ y ,\ z in [-1,1]` such that `cos^(-1)x+cos^(-1)y+cos^(-1)z=0` , find `x+y+z` .

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`x,y,z in [−1,1]`
`−1<=x<=1,−1<=y<=1,−1<=z<=1`
`0<=cos ^ (−1) x<=pi,0<=cos^ (−1) y<=pi,0≤cos^ ^(−1) ...
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