If \[A+B=\frac{\pi }{4},\]then \[(1+\tan A)(1+\tan B)=\]

1.	If \[A+B=\frac{\pi }{4},\]then \[(1+\tan A)(1+\tan B)=\]
A.	1
B.	2
C.	\[\infty \]
D.	-2
Answer» C. \[\infty \]

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If \[A+B=\frac{\pi }{4},\]then \[(1+\tan A)(1+\tan B)=\]

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