Find the general solution for f(x) = 27 tan^2 x-9=0

Answer 1

27tan^2 x = 9
tan^2 x = 1/3
tanx = ± 1/√3
x = 30° , 150° , 210° or 330°

general
x = (30 + 180k)° , where k is an integer
x = (150+180k)° , where k is an integer