Another student has provided the solution below to the given trigonometric equation. Identify any errors, and explain what mistake they made. 4 cos² (x) 3,0 ≤ 0 ≤ 2π i) cos² (x) = ³ (x) ii) COS iii) x = √3 2 cos 3-¹ (√³) 2 iv) x = 30 v) Other solutions: a = 30°, 120°, 210, 300°

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