Math/Trigonometry

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1. Solve: 2 cos² x - 3 cos x + 1 = 0 for 0 ≤ x < 2pi.


2. Solve: 2 sin x - 1 = 0 for 0° ≤ x < 360°


3. Solve: sin² x = cos² x for 0° ≤ x < 360°


4. Solve: sin x - 2sin x cos x = 0 for 0 ≤ x < 2p

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