Question

Прошу, помогите


$\frac{1-cos^{2}t }{1-sin^{2}t } =$

Answer 1

$\frac{1 - { \cos }^{2} t}{1 - \sin^{2}t } = \frac{ { \sin }^{2}t }{ \cos^{2} t} = {tg}^{2} t$