How to Find the Derivative of the Function f(x) = cos(x) Using the Chain Rule

Dx {cos x}=?

To find the derivative of the function f(x) = cos(x), we can use the chain rule and the derivative of the cosine function

To find the derivative of the function f(x) = cos(x), we can use the chain rule and the derivative of the cosine function.

The chain rule states that if we have a composite function g(f(x)), then the derivative of g(f(x)) with respect to x is given by:

(g(f(x)))’ = g'(f(x)) * f'(x)

In this case, g(x) = cos(x), so we need to find the derivative of cos(x) first.

The derivative of cos(x) is given by:

d/dx (cos(x)) = -sin(x)

Now we substitute this back into the chain rule:

d/dx (cos(x)) = -sin(x) * d/dx (x)

Since the derivative of x with respect to x is 1, we can simplify further:

d/dx (cos(x)) = -sin(x) * 1

Finally, the derivative of cos(x) is:

d/dx (cos(x)) = -sin(x)

Therefore, dx {cos x} = -sin(x).

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