How to Find the Derivative of cos(x) and its Application of Chain Rule

d/dx(cosx)

To find the derivative of cos(x) with respect to x, we can use the differentiation rules

To find the derivative of cos(x) with respect to x, we can use the differentiation rules.

The derivative of cos(x) can be found using the chain rule, which states that if we have a function of the form f(g(x)), the derivative of f(g(x)) with respect to x is given by f'(g(x)) * g'(x).

In this case, f(u) = cos(u) and g(x) = x, so we can write the derivative as follows:

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

Now, g(x) = x, and its derivative g'(x) is simply 1. Therefore, we have:

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

So, the derivative of cos(x) with respect to x is -sin(x).

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How to Find the Derivative of sin(x) Using Basic Derivative Rules and the Chain Rule

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