Решите: ↓↓↓ tg²x=1/9;

Question

Решите: ↓↓↓
tg²x=1/9;

Answer 1

Tgx=-1/3⇒x=-arctg1/3+πn,n∈z
tgx=1/3⇒x=arctg1/3+πk,k∈z