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3 tan²3x = 1
tan²3x = 1/3
tan3x = +√3/3 ∧ - √3/3
yang pertama :
tan3x = √3/3
3x = 30 ∧ 210
3x = 30 3x = 210
x = 10 x = 70
yang kedua :
tan3x = - √3/3
3x = 150 ∧ 330 3x = 330
x = 50 x = 110
yang memenuhi adalah saat 3x = 30,150,210,330
untuk k = 1
3x = 30 ⇒ (k.360 + α) / 3 = (360 + 30) / 3 = 130
3x = 150 ⇒ (k.360 + α) / 3 = (360 + 150) / 3 = 170
3x = 210 ⇒ (k.360 + α) / 3 = (360 + 210)/3 = 190
3x = 330 ⇒ (k.360 + α) / 3 = (360 + 330) / 3 = 230
untuk k = 2
3x = 30 ⇒ (k.360 + α) / 3 = (720 + 30) / 3 = 250
3x = 150 ⇒ (k.360 + α) / 3 = (720 + 150) / 3 = 290
3x = 210 ⇒ (k.360 + α) / 3 = (720 + 210)/3 = 310
3x = 330 ⇒ (k.360 + α) / 3 = (720 + 330) / 3 = 350
jadi himpunan penyelesainnya adalah x = { 10, 50, 70, 110, 130, 170, 190, 230, 250, 290, 310, 350 }