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If cos^-1x+cos^-1y+cos^-1 z=pi, then (A...

If `cos^-1x+cos^-1y+cos^-1 z=pi, then ` (A) `x^2+y^2=z^2` (B) `x^2+y^2+z^2=0` (C) `x^2+y^2+z^2=1` (D) none of these

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