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*Think back to the unit circle and how the Trig Functions are connected to it, the Domain and Range of Trig Functions are connected with the Unit Circle.*

The ** domain **of a function is the set of 'x' values for which the function is defined.

** **The ** range **of a function is the set of 'y' values for which the function is defined

*How are the x and y values in the Unit Circle linked to Trig Functions? Look here for a refresher*

Sine and cosine's domain are all real numbers but their range is from -1<y<1

Just remeber the x and y values in the Unit Circle are linked back to the Trig Functions