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JAMB Mathematics 2009 Objective — Question 36

Question 36 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2009 Objective paper, with the correct answer and a full explanation.

If y = 3cos4x, dy/dx equals

A. 6 sin8x
B. -24 sin4x
C. 12 sin4x
D. -12 sin4xCorrect

Explanation

dy/dx = 3 x (-sin4x) x 4 = -12 sin4x.

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