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JAMB Mathematics 2015 Objective — Question 13

Question 13 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2015 Objective paper, with the correct answer and a full explanation.

If y = 3sin(−4x), dy/dx is

A. −12cos(−4x)Correct
B. −12cos(4x)
C. 12xcos(4x)
D. 12sin(−4x)

Explanation

dy/dx = 3×(−4)cos(−4x) = −12cos(−4x).

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