Understanding the Derivative of the Cosine Function Using the Chain Rule and Sine Function

Derivative of cos x

The derivative of cos x can be found using the chain rule and the derivative of the sine function

The derivative of cos x can be found using the chain rule and the derivative of the sine function.

The derivative of cos x can be written as:

d/dx(cos x) = d/dx(sine of (π/2 – x))

Using the chain rule, we can rewrite this as:

d/dx(sine of (π/2 – x)) = cos(π/2 – x) * d/dx(π/2 – x)

The derivative of (π/2 – x) with respect to x is -1.

Therefore, the derivative of cos x is:

d/dx(cos x) = -sin(π/2 – x)

Since sin(π/2 – x) = cos x, we can simplify this to:

d/dx(cos x) = -sin x

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

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