Question

cos x /1 +sen x + cos x/1-senx

Answer 1

${ \frac{cosx}{1+senx} + \frac{cosx}{1-senx} =}\\\\{ \frac{cosx(1-senx)+cosx(1+senx)}{(1-senx)(1+senx)} =}\\\\{ \frac{cosx-cosx.senx+cosx+cosx.senx}{1-sen^2x} =}\\\\{\text{elimino terminos semejantes}}\\\\{ \frac{2cosx}{cos^2x} =}\\\\{ \frac{2}{cosx} =}\\\\{\boxed{2secx}}\\\\{\text{salu2.!! :)}}$