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1 = √3 tan (x + 15°)
tan (x + 15°) = 1/√3 × √3/√3
tan (x + 15°) = 1/3√3
tan (x + 15°) = tan 30°
x + 15° = 30° + k . 360°
Utk k = 0:
x + 15° = 30° + 0 . 360°
x + 15° = 30°
x = 30° - 15°
x = 15° = π/12
Utk k = 1/2:
x + 15° = 30° + 1/2 . 360°
x + 15° = 30° + 180°
x + 15° = 210°
x = 210° - 15°
x = 195° = 13/12π
HP = {π/12, 13/12π}
= 1
=
Maka,
x =
atau
x =
∴Jadi himpunan penyelesaian x yang memenuhi untuk interval 0 < x ≤ 2π yaitu
HP = {x | x = atau x = }