WAEC Further Mathematics 2022 Objective — Question 30
Question 30 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2022 Objective paper, with the correct answer and a full explanation.
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Solve 4sin²θ+1=2, where 0°<θ<180°.
- A. 60°, 120°
- B. 30°, 150°Correct
- C. 30°, 120°
- D. 60°, 150°
Explanation
4sin²θ=1, so sin²θ=¼, sinθ=±½. For 0°<θ<180°, sinθ=½ gives θ=30° or θ=150°.
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