2sinx.tan3x+tan3x-2sinx=1

tan(3x) (2sin(x) + 1) - (2sin(x) + 1) = 0 (kumpulkan di ruas kiri trus faktorkan)
(2sin(x) + 1) (tan(3x)-1) = 0

2sinx + 1 = 0 v tan3x - 1 = 0

* sinx = -1/2
x = 210 v x = 330

* tan 3x = 1
3x = 45 + k.180
x= 15 +k. 60
x=15 , x=75, x =135, x=195, x=255, x=315

HP={15,75,135,195,210,255,315,330}