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WAEC Further Mathematics 2017 Question 13

Question 13

Trigonometry

Express Cos 150° in surd form.

  1. A.−√3
  2. B.−√3/2
  3. C.−½
  4. D.√2/2
Show the answer and explanation

Answer: B (−√3/2)

Explanation

cos 150° = −cos 30° = −√3/2.