If y = 3 cos 4x, dy/dx equals?
MATHEMATICS
JAMB 2009
If y = 3 cos 4x, dy/dx equals?
- A. 6 sin 8x
- B. -24 sin 4x
- C. 12 sin 4x
- D. -12 sin 4x
Correct Answer: D. -12 sin 4x
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