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Contains formulas to help with pythagorean identities, unit circle values, periods of trig functions, angle addition identities, and much more.
Pauls Online Math Notes
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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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Almost all of the Trigonometric Identities, including Reciprocal identities, Pythagorean identities, Quotient identities, Co-Function identities, Even-Odd identities, Sum-Difference formulas, Double- and Half-angle formulas, and Sum-to-Product and Product-to-Sum formulas.
Table of Trigonometric Identities
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The perfect study site for high school, college students and adult learners. Get help to do your homework, refresh your memory, prepare for a test, ....
SOS math
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Explains how we can use the unit circle to find the trig functions for any angle, explains inverse functions, and how to graph them.
Dave's Short Trig Course
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How to solve trigonometric equations.
SOS Math
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Several worked example problems that point out mistakes students usually make when solving them.
Pauls Online Math Notes
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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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