\[{{\tan }^{-1}}\left( \frac{x}{y} \right)-{{\tan }^{-1}}\,\left( \frac{x-y}{x+y} \right)\] is [EAMCET 1992]

\[\frac{\pi }{4}\]or \[-\frac{3\pi }{4}\]

\[{{\tan }^{-1}}\left( \frac{x}{y} \right)-{{\tan }^{-1}}\,\left( \fra

1.	\[{{\tan }^{-1}}\left( \frac{x}{y} \right)-{{\tan }^{-1}}\,\left( \frac{x-y}{x+y} \right)\] is [EAMCET 1992]
A.	\[\frac{\pi }{2}\]
B.	\[\frac{\pi }{3}\]
C.	\[\frac{\pi }{4}\]
D.	\[\frac{\pi }{4}\]or \[-\frac{3\pi }{4}\]
Answer» D. \[\frac{\pi }{4}\]or \[-\frac{3\pi }{4}\]

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\[{{\tan }^{-1}}\left( \frac{x}{y} \right)-{{\tan }^{-1}}\,\left( \frac{x-y}{x+y} \right)\] is [EAMCET 1992]

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