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If \(\theta+\phi=\frac{\pi}{4}\), then \((1+\tan \theta)(1+\tan \phi)\) is equal to
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\(\begin{aligned}
& \text { Hints: }(1+\tan \theta)\left(1+\frac{(1-\tan \theta)}{1+\tan \theta}\right) \\
& =(1+\tan \theta) \frac{2}{1+\tan \theta}=2
\end{aligned}\)
& \text { Hints: }(1+\tan \theta)\left(1+\frac{(1-\tan \theta)}{1+\tan \theta}\right) \\
& =(1+\tan \theta) \frac{2}{1+\tan \theta}=2
\end{aligned}\)
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