Pls solve the sum no.19

Dear Student,

\frac{\cos θ + \sin θ}{\cos θ - \sin θ} = \frac{\frac{\cos θ}{\cos θ} + \frac{\sin θ}{\cos θ}}{\frac{\cos θ}{\cos θ} - \frac{\sin θ}{\cos θ}} = \frac{1 + \tan θ}{1 - \tan θ} = \frac{1 - \frac{5}{12}}{1 + \frac{5}{12}} = \frac{7}{17}

Regards