Periodic Functions: Sine and cosine are periodic functions, which means that sine and cosine graphs repeat themselves in patterns. You can graph sine and cosine functions by understanding their period and amplitude.

### What Are Periodic Trigonometric Functions?

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- What Are Periodic Trigonometric Functions?. (2013, March 2). In
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- Cynthia Kirkeby, “What Are Periodic Trigonometric Functions?.”
*ClassBrain Math Tutorials*. 2 March 2013, 11:19 UTC. . 26 Apr 2017 <http://www.classbrainmath.com/periodic-trigonometric-functions/>. - MHRA style
- Cynthia Kirkeby, 'What Are Periodic Trigonometric Functions?',
*ClassBrain Math Tutorials*, 2 March 2013, 11:19 UTC, <http://www.classbrainmath.com/periodic-trigonometric-functions/> [accessed 26 April 2017] - The Chicago Manual of Style
- Cynthia Kirkeby, “What Are Periodic Trigonometric Functions?.”
*ClassBrain Math Tutorials*, http://www.classbrainmath.com/periodic-trigonometric-functions/ [accessed April 26, 2017]. - CBE/CSE style
- Cynthia Kirkeby, What Are Periodic Trigonometric Functions? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 11:19 UTC [cited 2017 Apr 26]. Available from: http://www.classbrainmath.com/periodic-trigonometric-functions/.
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- Cynthia Kirkeby, What Are Periodic Trigonometric Functions?. ClassBrain Math Tutorials. March 2, 2013, 11:19 UTC. Available at: http://www.classbrainmath.com/periodic-trigonometric-functions/. Accessed April 26, 2017.