If \( \tan ^{-1} x-\tan ^{-1} y=\frac{\pi}{4} \) and \( x y1 \), th...

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If \( \tan ^{-1} x-\tan ^{-1} y=\frac{\pi}{4} \) and \( x y1 \), then find the
\( \mathrm{P} \)
value of \( x-y-x y \).
W
(1) 1
(2) -1
(3) 0
(4) 2
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