- $$\frac{{\tan \left( {\alpha + \varphi } \right)}}{{\tan \alpha }}$$
- $$\frac{{\tan \alpha }}{{\tan \left( {\alpha + \varphi } \right)}}$$
- $$\frac{{\tan \left( {\alpha - \varphi } \right)}}{{\tan \alpha }}$$
- $$\frac{{\tan \alpha }}{{\tan \left( {\alpha - \varphi } \right)}}$$
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