Question on: JAMB Mathematics - 2009
If y = 3 cos 4x, (\frac{dy}{dx}) equals
A
6 sin 8x
B
-24 sin 4x
C
12 sin 4x
D
-12 sin 4x
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Correct Option: D
If y = 3 cos 4x, (\frac{dy}{dx}) equals
(\frac{dy}{dx}) = 3(4 - sin 4x)
= -12 sin 4x
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