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WAEC Further Mathematics 2025 Question 39

Question 39

Trigonometry

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

  1. A.60°
  2. B.120°
  3. C.210°
  4. D.240°
Show the answer and explanation

Answer: D (240°)

Explanation

cos y < 0 and tan y > 0 put y in the third quadrant. The reference angle is 60°, so y = 180° + 60° = 240°.