WAEC Mathematics 2008 Question 28

Question 28

Trigonometry

If cos (x + 25)° = sin 45°, find the value of x.

  1. A.20
  2. B.30
  3. C.45
  4. D.60
Show the answer and explanation

Answer: A (20)

Explanation

sin 45° = cos 45°, so x + 25 = 45 and x = 20.