Respuesta :

[tex] (\frac{1}{cos \alpha } +\frac{1}{sen \alpha})(\frac{1}{cos \alpha } -\frac{1}{sen \alpha})[/tex]
[tex](\frac{sen \alpha+cos \alpha}{cos \alpha *sen \alpha})(\frac{sen \alpha-cos \alpha}{cos \alpha *sen \alpha}) [/tex]