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This youtube video shows an easy way to remember the values of the unit circle that can be helpful for trigonometry students.
Unit Circle Tricks
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An excellent source of examples and facts. This site also provides online flashcards for students to test their knowledge of the identities and trig functions.
mathmistakes.info
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An interactive website that gives a good introduction to the six trigonometric functions.
themathpage
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This page will make an xy plot of some mathematical expression for you. Including sin(x), cos(x), and tan(x).
WebMath
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