$\int$ $\frac { \cos x - \sin x } { \cos x + \sin x }$

Short Answer

$\int$ $\frac { \cos x - \sin x } { \cos x + \sin x }$ dx
Enter your answer with any coefficients in front as integers or reduced fractions of form $\frac { a } { b }$ .
No parentheses around arguments of functions.