Помогите решить!!! Найти tg альфа, если cos альфа равен -3/5 и, п<альфа<3п/2 - №19094386

Помогите решить!!!
Найти tg альфа, если cos альфа равен -3/5 и, п<альфа<3п/2
- Предмет:
  Математика
- Автор:
  luis2ypo
- 6 лет назад

Ответы 1

1+tg^α =1/cos^2α ⇒ tg^2α =1/(-3/5)^2-1= 16/9 ⇒ tgα =4/3, т.к. в 3-ей четверти tgα>0
- Автор:
  silver87
- 6 лет назад
- 0
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