Mathematics

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

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