tan 2x=1/3√3 himpunan dri 0

dianggap gini.... dan bukan Phi, tapi Pi
tan2x = (1/3)√3
tan2x = tan30
2x = 30 + 180k
x = 15 + 90k
k = 0 → x = 15°
k = 1 → x = 105°
k= 2 → x = 195°
k = 3 → x = 285°