gaokao 2019 Q14

gaokao · China · national-I-arts Addition & Double Angle Formulae Addition/Subtraction Formula Evaluation

14. Given $\tan \left( \alpha + \frac { \pi } { 4 } \right) = 6$, then $\tan \alpha = $ \_\_\_\_.

$\frac { 121 } { 3 }$

14. Given $\tan \left( \alpha + \frac { \pi } { 4 } \right) = 6$, then $\tan \alpha = $ \_\_\_\_.