Question

Решите уравнени:

3tg^2x+6tgx-9=0

 

Answer 1

tgx=t
3t^2+6t-9=0
t^2+2t-3=0
t1=1
t2=-3
tgx=-3
x=-arctg(3)+Пk
tgx=1
x=П/4+пk