Master the Chain Rule: Finding the Derivative of cos(x) using the Chain Rule

d/dx [cosx]

To find the derivative of cos(x), we can use the chain rule

To find the derivative of cos(x), we can use the chain rule. Recall that the derivative of the cosine function, cos(x), is equal to the negative sine function, -sin(x).

Using the chain rule, we have:

d/dx [cosx] = d/dx [cos(u)] * du/dx,

where u = x.

Now, let’s find du/dx:

du/dx = 1.

Therefore, we have:

d/dx [cosx] = d/dx [cos(u)] * du/dx
= -sin(u) * 1
= -sin(x).

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

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