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WAEC Mathematics 1993 Question 29

Question 29

Trigonometry

If sin x = cos 50°, then x equals

  1. A.40°
  2. B.45°
  3. C.50°
  4. D.90°
  5. E.130°
Show the answer and explanation

Answer: A (40°)

Explanation

sin x = cos(90° − x), so cos(90° − x) = cos 50° and x = 40°.