If \[{{\tan }^{-1}}x+{{\tan }^{-1}}y=\frac{\pi }{4}\] then [Karnataka CET 2005]

If \[{{\tan }^{-1}}x+{{\tan }^{-1}}y=\frac{\pi }{4}\] then [Karnata

1.	If \[{{\tan }^{-1}}x+{{\tan }^{-1}}y=\frac{\pi }{4}\] then [Karnataka CET 2005]
A.	\[x+y+xy=1\]
B.	\[x+y-xy=1\]
C.	\[x+y+xy+1=0\]
D.	\[x+y-xy+1=0\]
Answer» C. \[x+y+xy+1=0\]

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If \[{{\tan }^{-1}}x+{{\tan }^{-1}}y=\frac{\pi }{4}\] then [Karnataka CET 2005]

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