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sin x = 0 ⇒ x = 0⁰ , 180⁰ , 360⁰
2 cos x + 1 = 0
cos x = -1/2 ⇒ x = 120⁰ , 240⁰
HP: {0⁰ , 120⁰ , 180⁰ , 240⁰ , 360⁰}