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WAEC Mathematics 2013 Question 24

Question 24

Trigonometry

If sin x = 5/13 and 0° ≤ x ≤ 90°, find the value of (cos x − tan x).

  1. A.7/13
  2. B.12/13
  3. C.79/156
  4. D.209/156
Show the answer and explanation

Answer: C (79/156)

Explanation

cos x = 12/13 and tan x = 5/12. 12/13 − 5/12 = (144 − 65)/156 = 79/156.