WAEC Further Mathematics 2025 Objective — Question 39

Question 39 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2025 Objective paper, with the correct answer and a full explanation.

Given that cos y = -1/2 and tan y > 0, find the value of y.

A. 60°
B. 120°
C. 210°
D. 240°Correct

Explanation

cos y negative and tan y positive both occur only in the third quadrant. The reference angle is 60°, so y = 180°+60° = 240°.

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