2cos(2x-30)=akar2 untuk 0_

Bab Trigonometri
Matematika SMA Kelas X

2 cos (2x - 30°) = √2
cos (2x - 30°) = 1/2 √2
2x - 30° = 45°
2x = 30° + 45°
x = 75° / 2
x = 37,5°

2x - 30° = 315
2x = 315° + 30°
x = 345° / 2
x = 172,5°

2x - 30° = 405°
2x = 405° + 30°
x = 435° / 2
x = 217,5°

2x - 30° = 675°
2x = 675° + 30°
x = 705° / 2
x = 352,5°

x = { 37,5°; 172,5°; 217,5°; 352,5° }