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The result $\tan^{-1}x-\tan^{-1}y=\tan^{-1}\bigg(\Large {\frac{x-y}{1+xy}}\normalsize \bigg)$ is true when value of xy is _____________.

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1 Answer

\( xy > -1\)
answered Feb 18, 2013 by thanvigandhi_1
 
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