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Domain, Range, and Signs of Trigonometric Functions

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Domain and Range of Trig Functions

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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

License: CC BY-NC 3.0

[Figure1]

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


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  1. [1]^ License: CC BY-NC 3.0

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