**How To Find Critical Numbers Of A Fraction**. To find the critical values of a function, we must set the derivate equal to 0. How to find the critical numbers of a trig function.

Thanks to all of you who support me on patreon. These include trig functions, absolute value functions, rational funct. Plug any critical numbers you found in step 2 into your original function to check that they are in the domain of the original function.