Respuesta :

ElenaClairmont
[tex] \frac{1}{ cos^{2} \alpha } + \frac{1}{ sin^{2} \alpha } = \frac{ sin^{2} \alpha + cos^{2} \alpha }{ sin^{2} \alpha * cos^{2} \alpha } = \frac{1}{sin^{2} \alpha * cos^{2} \alpha} [/tex]