# Rules of Differentiation: Derivative of Trigonometric
Functions

### Erin Horst

Now that we have explored derivatives, we can now progress
to the rules of differentiation. These rules are simply formulas
that instruct the learner how to compute derivatives depending
on a given function.

When differentiating trigonometric functions, special differentiation
rules apply. They are:

To illustrate derivatives of trigonometric functions, consider
the following functions and their respective derivatives. It is
suggested that you compute the derivative to verify the function
of the derivative.

The following graph illustrates the function y=sin(3x) and
its derivative y'=3cos(3x).

The following graph illstrates the function
and its derivative

Return