2 sin kuadrat x-1=0 , 0 < x < 360.Tentukan HP

Persamaan Trigonometri

2 sin² x - 1 = 0
2 sin² x = 1
sin² x = 1/2
sin x=  1/2 √2  atau sin x = - 1/2 √2
.
sin x = 1/2 √2  = sin 45 = sin 135
x = 45 , 135

sin x = - 1/2 √2 = sin 225 = sin 315
x = 225, 315

HP x = (45, 135, 225, 315)