gaokao 2018 Q15

gaokao · China · national-II-arts 5 marks Addition & Double Angle Formulae Addition/Subtraction Formula Evaluation

Given $\tan \left( \alpha - \frac { 5 \pi } { 4 } \right) = \frac { 1 } { 5 }$, then $\tan \alpha = $ \_\_\_\_ .

Given $\tan \left( \alpha - \frac { 5 \pi } { 4 } \right) = \frac { 1 } { 5 }$, then $\tan \alpha = $ \_\_\_\_ .