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JAMB Mathematics 2011 Question 40

Question 40

Integration

Find ∫cos 4x dx.

  1. A.¾ sin 4x + k
  2. B.−¼ sin 4x + k
  3. C.−¾ sin 4x + k
  4. D.¼ sin 4x + k
Show the answer and explanation

Answer: D (¼ sin 4x + k)

Explanation

The derivative of sin 4x is 4 cos 4x, so ∫cos 4x dx = ¼ sin 4x + k.