Find the Derivative - d/dx cos(4x)

Problem

d(cos(4*x))/d(x)

Solution

1. Identify the outer function as cos(u) and the inner function as u=4*x

2. Apply the chain rule, which states that the derivative of ƒ*(g(x)) is ƒ′*(g(x))⋅g(x)′

3. Differentiate the outer function cos(u) to get −sin(u)

4. Differentiate the inner function 4*x to get 4

5. Multiply the results together to find the final derivative.

Final Answer

d(cos(4*x))/d(x)=−4*sin(4*x)

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