Ребята,спасайте. Помогите доказать тождество
[tex] \frac{2cos \alpha *sin \beta +sin( \alpha - \beta )}{2cos \alpha -cos \beta -cos( \alpha - \beta )} = tg( \alpha + \beta )[/tex]
[tex] \frac{2cos \alpha *sin \beta +sin( \alpha - \beta )}{2cos \alpha -cos \beta -cos( \alpha - \beta )} = tg( \alpha + \beta )[/tex]
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