Derivative of Cosine Function: Understanding the Math Behind the Negative Sine Relationship

Dx {cos x}=?

To find the derivative of the function f(x) = cos(x), you can use the derivative rules for trigonometric functions

To find the derivative of the function f(x) = cos(x), you can use the derivative rules for trigonometric functions.

The derivative of the cosine function, cos(x), is given by the derivative of the sine function, sin(x), with a negative sign in front. So, we have:

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

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

In mathematical notation:

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

This means that at any point x, the rate of change of the cosine function is equal to the negative value of the sine function at that point.

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