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$\tan ^{-1}x +\tan ^{-1} y +\tan ^{-1} z= \large\frac{\pi}{2}$$=>1-xy-yz-zx=$

\[\begin {array} {1 1} (1)\;1 & \quad (2)\;0 \\ (3)\;-1 & \quad (4)\;2 \end {array}\]
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answered Nov 7, 2013 by pady_1
 

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