# Trigonometric Functions

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 Trig Formula/Identity Help Sheet     Contains formulas to help with pythagorean identities, unit circle values, periods of trig functions, angle addition identities, and much more. Pauls Online Math Notes trig formulas     trig formulas StudyStack A Trick to Remember the Unit Circle Values     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 Table of Trigonometric Identities     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 free resource for math review material from Algebra to Differential Equations!     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 Trigonometric functions and their inverses     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 Solve Trigonometric Equations     How to solve trigonometric equations. SOS Math Common Trig Errors     Several worked example problems that point out mistakes students usually make when solving them. Pauls Online Math Notes Plot a Mathematical Expression     This page will make an xy plot of some mathematical expression for you. Including sin(x), cos(x), and tan(x). WebMath Trig Mistakes and Facts     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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