If y = 3 cos 4x, dy/dx equals
-
A.
6 sin 8x -
B.
-24 sin 4x -
C.
12 sin 4x -
D.
-12 sin 4x
Correct Answer: Option D
Explanation
y = 3 cos 4x
dy/dx = 3x -4 sin 4x
= -12sin 4x
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