Prove $\tan \left( x + \frac { \pi } { 4 } \right) = \frac { 1 + \tan x } { 1 - \tan x }$

question 112

Essay

Prove $\tan \left( x + \frac { \pi } { 4 } \right) = \frac { 1 + \tan x } { 1 - \tan x }$ .

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