Question

Помогите!!......................​

Answer 1

Ответ:

1 Б, 2В, 3Г

Пошаговое объяснение:

tg130°=sin130°/cos130°=sin(90°+40°)/cos(90°+40°)=cos40°/-sin40°=-ctg40°

ctg220°= cos220°/sin220°=cos(180°+40°)/sin(180°+40°)=

-cos40°/-sin40°=ctg40°

tg140°=sin140°/cos140°=sin(180°-40°)/cos(180°-40°)=sin40°/-cos40°=-tg40°