0580/42 May/Jun 2026, Question 14: Trigonometry beyond 90°
Cambridge IGCSE Mathematics 0580 · Paper 42 (Extended) · Calculator · 2 marks
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The question, in short
Given cos x = 0.41, find the reflex angle x.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 2 marks
- 1cos⁻¹(0.41) = 65.795…°
- 2Reflex angle with the same cosine = 360° − 65.795…°
- 3x = 294.2°
Answer294.2…
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