MCQ
જો $(1 + \tan \theta )(1 + \tan \phi ) = 2$, તો $\theta + \phi =$ .....$^o$
- A${30}$
- ✓${45}$
- C${60}$
- D${75}$
$\Rightarrow \frac{{\tan \theta + \tan \phi }}{{1 - \tan \theta \tan \phi }} = 1$
$ \Rightarrow $ $\tan (\theta + \phi ) = 1$
$ \Rightarrow $ $\theta + \phi = \frac{\pi }{4} = 45^\circ$.
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