Asked by Amanda

Find the derivative of
cos^2(4x)
Answered by MathMate
Use the chain rule:
d(f(u(x))/dx=df/du.du/dx
d(cos²(4x))/dx
=2cos(4x)d(cos(4x))/dx
=2cos(4x)(-sin(4x))d(4x)/dx
=2cos(4x)(-sin(4x))(4)
=-8sin(4x)cos(4x)
=-4sin(8x)

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