[Free Registration/Login may be required to access all resource tools.] This lesson uses trigonometric identities to prove other identities.

[Free Registration/Login may be required to access all resource tools.] Illustrates identities found from dividing two trigonometric functions.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students to solve word problems using trigonometric ratios.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students to use inverse trigonometric ratios to solve for missing angles in right triangles.

[Free Registration/Login may be required to access all resource tools.] Simplify trigonometric expressions using identities.

Provides trigonometric identities, which include fundamental identities, even-odd identities, addition formulas, double-angle formulas, subtraction formulas, product-sum formulas, and identities for sin squared and cos squared.

[Free Registration/Login may be required to access all resource tools.] Use a calculator to find trigonometric ratios.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students to find trigonometric ratios with a calculator in order to find missing sides of right triangles.

Students explore trigonometry concepts through this collection of definitions, lessons, examples problem-solving steps and strategies, and practice problems. Topics include solving triangles, trigonometric functions, theorems, and the...

Students will define basic terms relating to trigonometry and use trigonometric ratios.

An "identity" is a tautology, an equation or statement that is always true, no matter what. Proving an identity is very different in concept from solving an equation. This resource demonstrates some useful techniques for proving...

This activity has the teacher to create 3 triangles on Cabri Jr. on the TI-83 or TI-84. It will prove to students how trigonometry ratios are found. It will show to the students where the ratios are derived rather than just telling the...

Students show comprehension of advanced mathematical concepts in Trigonometry. The online quiz assesses the scholars on basic trigonometric identities.

A collection of lessons and practice exercises on trigonometric ratios. Students will learn how to solve for an angle and for a side, and to apply trigonometry in setting up and solving word problems.

Excellent site reviewing the realms of Trigonometry. Topics Include the trig functions, graphs, right triangles and much more.

The Northeast Parallel Architectures Center, Syracuse University, provides a review and tutorial site on trigonometry. The information is in-depth and can be accessed by clicking on the various links in the outline.

In addition to understanding the concept of similar right triangles and how they apply to trigonometric ratios, young scholars explore a clinometer app, and discover how it can be used to test the mathematics underpinning trigonometry.

This site is a quick review of the functions and identities in trigonometry. Very helpful site.

[Free Registration/Login may be required to access all resource tools.] How to Compose a trigonometric function.

[Free Registration/Login may be required to access all resource tools.] Derivation of double angle identities for sine, cosine, and tangent.

[Free Registration/Login may be required to access all resource tools.] Defining trigonometric identities that rely on the Pythagorean Theorem.

College professor Dan Bach reviews basic trig concepts, including trig functions, right triangles, circles, radians, and polar coordinates. Site includes animated graphs and detailed examples.

[Free Registration/Login may be required to access all resource tools.] Use the inverse trigonometric ratios.

[Free Registration/Login may be required to access all resource tools.] This lesson covers the inverses of all six trig functions.