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If $\alpha+\beta+r=2 \pi$, then :

• ✓
  $\tan \frac{\alpha}{2}+\tan \frac{\beta}{2}+\tan \frac{r}{2}=\tan \frac{\alpha}{2} \tan \frac{\beta}{2} \tan \frac{r}{2}$
• B
  $\tan \frac{\alpha}{2}+\tan \frac{\beta}{2}+\tan \frac{r}{2}=-\tan \frac{\alpha}{2} \tan \frac{\beta}{2} \tan \frac{r}{2}$
• C
  $\tan \frac{\alpha}{2} \cdot \tan \frac{\beta}{2}+\tan \frac{\beta}{2} \tan \frac{r}{2}+\tan \frac{r}{2} \cdot \tan \frac{\alpha}{2}=1$
• D
  $\tan \alpha \cdot \tan \beta+\tan \beta \cdot \tan r+\tan r \cdot \tan \alpha=1$