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Karena diminta lancip, maka x = 30°
Sehingga,
tan x = tan 30°
Bawah.
Dengan:
Sehingga,
Dengan:
x₁+30° = 30°, sehingga x₁ = 0
x₂+30° = 330°, sehingga x₂ = 300°
Maka, selesaian:
HP = {x | 0°,300°}