3 cos 5x -3/2 =0:0°≤×≤360°
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Penjelasan dengan langkah-langkah:
3 cos 5x - 3/2 = 0
3 cos 5x = 3/2
cos 5x = ½
cos 5x = cos 60°
5x = 60° + k.360°
x = 12° + k.72°
k = 0 ➡ x = 12° + 0° = 12°
k = 1 ➡ x = 12° + 72° = 84°
k = 2 ➡ x = 12° + 144° = 156°
k = 3 ➡ x = 12° + 216° = 228°
k = 4 ➡ x = 12° + 288° = 300°
cos 5x = cos (360 - 60)°
5x = 300° + k.360°
x = 60° + k.72°
k = 0 ➡ x = 60° + 0° = 60°
k = 1 ➡ x = 60° + 72° = 132°
k = 2 ➡ x = 60° + 144° = 204°
k = 3 ➡ x = 60° + 216° = 276°
k = 4 ➡ x = 60° + 288° = 348°
untuk interval 0° ≤ x ≤ 360°
HP = {12°, 60°, 84°, 132°, 156°, 204°, 228°, 276°, 300°, 348°}
Semoga Bermanfaat
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