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$$\lt br/\gt \tan^{-1}x - \tan^{-1}y =\lt br/\gt \begin{cases}\lt br/\gt \tan^{-1}\Bigl(\frac{x - y}{1 + xy}\Bigr), & xy \gt -1,\\
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$$\lt br/\gt \tan^{-1}x - \tan^{-1}y =\lt br/\gt \begin{cases}\lt br/\gt \tan^{-1}\Bigl(\frac{x - y}{1 + xy}\Bigr), & xy \gt -1,\\
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