If x + y + z = xyz, then tan-1x + tan-1y + tan-1z =
π/2
1
tan-1 (xyz)
π
If tan−1x+tan−1y+tan−1z=π, then x+y+z is equal to [Kerala (Engg.) 2002]
If tan−1x+tan−1y+tan−1z=π2,then xy+yz+zx=