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If sinx+siny+sinz=cosx+cosy+cosz=0, then...

If `sinx+siny+sinz=cosx+cosy+cosz=0, then (A) `sin2x+sin2y+sin2z=0` (B) `cos2x+cos2y+cos2z=0` (C) `tanx+tany+tanz=0` (D) none of these

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