If \( x+y+z=x y z \), then \( \tan ^{-1} x+\tan ^{-1} y+\tan ^{-1} z= \)
(A) \( \pi / 2 \)
(B) 1...
If \( x+y+z=x y z \), then \( \tan ^{-1} x+\tan ^{-1} y+\tan ^{-1} z= \)
(A) \( \pi / 2 \)
(B) 1
(C) none of these
(D) undefined
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