gaokao 2020 Q9

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

Given $2 \tan \theta - \tan \left( \theta + \frac { \pi } { 4 } \right) = 7$ , then $\tan \theta =$
A. $- 2$
B. $- 1$
C. $1$
D. $2$

Given $2 \tan \theta - \tan \left( \theta + \frac { \pi } { 4 } \right) = 7$ , then $\tan \theta =$

A. $- 2$

B. $- 1$

C. $1$

D. $2$