2sin(3x-15derajat) = akar 2 tentukan nilai x!

sin (3x-15) = 1/2 akar 2
sin (3x - 15) = sin 45

3x - 15 = 45 + k.360
x = 20 +-k.120
k =0, x = 20°
k = 1, x = 140°
k=2, x = 260°

3x - 15 = 135 + k.360
x = 50 + k.120
k=0, x = 50°
k=1, x = 170°
k=2, x = 290°

HP = {20°,50°,140°,170°,260°,290°}