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19. ก ำหนดให ้𝑆 = {𝑥 | 0 < 𝑥 < 2𝜋 และ 125(54 cos 2𝑥) = 4(54 cos2 𝑥) + 25} 𝑆 เป็นสบัเซตของเซตใดต่อไปน้ี
ก. {𝜋
8,
3𝜋
8,
5𝜋
8,
10𝜋
8,
12𝜋
8,
14𝜋
8}
ข. {𝜋
6,
2𝜋
6,
4𝜋
6,
7𝜋
6,
8𝜋
6,
9𝜋
6}
ค. {𝜋
4,
2𝜋
4,
3𝜋
4,
5𝜋
4,
6𝜋
4,
7𝜋
4}
ง. {𝜋
6,
𝜋
4,
3𝜋
6,
3𝜋
4,
8𝜋
6,
7𝜋
4}
จ. {𝜋
3,
𝜋
4,
2𝜋
3,
3𝜋
4,
5𝜋
3,
7𝜋
4}
14
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