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tan 2x = 1/akar(3)
hasilnya positif berarti sudut 2x di kuadran 1 & 3
0 <= x <= 360
kuadran 1 :
tan 2x = 1/akar(3) = tan 30
jadi
2x = 30
x = 15 = 1/12 phi
tan 2x = tan 390
2x = 390
x = 195 = 13/12 phi
kuadran 3
tan 2x = tan 210
2x = 210
x = 105 = 7/12 phi
tan 2x = tan 570
2x = 570
x = 285 = 19/12 phi
jadi jawabannya A