Пожалуйста!!!!Помогите!!!Плачу 30 баллов !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Выведите из формул :1- 1+tg^2a=1/cos^2a , cosa=?,tga=?

2- 1+ctg^2a=1/sin^2a, sina=?, ctga=?
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