By geometrical interpretation, prove that
`tan(alpha+beta)=(tanalpha+tanbeta)/(1-tanalphatanbeta)`.

Explanation

To prove the identity \( \tan(\alpha + \beta) = \frac{\tan \alpha + \tan \beta}{1 - \tan \alpha \tan \beta} \) using geometrical interpretation, we can follow these steps:

### Step 1: Draw a Right Triangle for Each Angle
1. Draw a right triangle for angle \( \alpha \) with:
- Opposite side = \( a \)
- Adjacent side = \( b \)
- Therefore, \( \tan \alpha = \frac{a}{b} \).

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