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

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

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

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