JAMB Mathematics 2014 Question 41

Question 41

Integration

Evaluate ∫sin 2x dx.

  1. A.−cos 2x + k
  2. B.cos 2x + k
  3. C.½cos 2x + k
  4. D.−½cos 2x + k
Show the answer and explanation

Answer: D (−½cos 2x + k)

Explanation

The integral of sin ax is −(1/a) cos ax. With a = 2 the answer is −½cos 2x + k.