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WAEC Mathematics 2012 Question 24

Question 24

Trigonometry

If cos (x + 40)° = 0.0872, what is the value of x?

  1. A.85°
  2. B.75°
  3. C.65°
  4. D.45°
Show the answer and explanation

Answer: D (45°)

Explanation

cos−1(0.0872) = 85°, so x + 40 = 85 and x = 45°.