Question on: JAMB Mathematics - 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
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Correct Option: D
y = 3 cos 4x
dy/dx = 3x -4 sin 4x
= -12sin 4x
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