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WAEC Mathematics 1993 Question 33

Question 33

Trigonometry

If sin x = 12/13, where 0° < x < 90°, find the value of 1 − cos2x.

  1. A.25/169
  2. B.64/169
  3. C.105/169
  4. D.144/169
  5. E.8/13
Show the answer and explanation

Answer: D (144/169)

Explanation

1 − cos2x = sin2x = (12/13)2 = 144/169.