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MATHEMATICS

JAMB 2017 - Question 39

Mathematics 2017 JAMB Past Questions - Question 39: If y = 3 cos 4x, dy/dx equals

Use the diagram to answer question

If y = 3 cos 4x, dy/dx equals

A: 6sin 8x

B: -24sin 4x

C: 12sin 4x

D: -12sin4x

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Correct Answer

Explanation

if y = 3cos 4x; dy /dx equalsdy /dx = 3(4-sin 4x)= -12 sin 4x