Texas Instruments
Texas Instruments: Right Triangle Trig
This is a way to use the TI-Navigator to check for an understanding of sin, cos, and tan before you move onto word problems.
Texas Instruments
Texas Instruments: Computing by Degrees!
In this activity, students use the calculator to solve trigonometry problems using sine, cosine, and tangent. They also find inverses of trigonometric functions.
Analyze Math
Analyze Math: Cosine Function
The mathematics tutorial explores the cosine function. The interactive tutorial investigates the period, phase shift, domain, and asymptotes of the cosine function.
Northeast Parallel Architectures Center, Syracuse University
Npac Reu Program: Trig Function Graphs
Northeast Parallel Architectures Center provides a quick overview of the graphs of the six trigonometric functions, with angles measured in radians.
Northeast Parallel Architectures Center, Syracuse University
Npac Reu Program: Trigonometric Functions
This Northeast Parallel Architectures Center of Syracuse University site offers a quick overview of the six trigonometric functions from the standpoint of the unit circle.
Wikimedia
Wikipedia: Trigonometric Function
This page from Wikipedia, a free and open-source encyclopedia, covers how to solve a variety of trigonometric equations, most of which involve substitution with a trigonometric identity. The identities themselves are not covered, but...
Other
North Carolina Su: Triangles, Circles, and Waves (Oh My!)
This site has a basic overview of trigonometry focusing on the trig functions, trig ratios, and the unit circle.
Clark University
Clark University: Dave's Short Trig Course: Trigonometric Functions
The Clark University site shows and explains the graphs of the six trigonometric functions. It explains how to find an arbitrary angle measurement using trig. Also, it explains that sine and cosine functions are complementary.
Clark University
Clark University: Dave's Short Trig Course
This Clark University trigonometry tutorial site features questions and answers about what students can learn from trigonometry.
Other
Dans Math: Lessons: Trigonometry
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.
Other
Interactive Trigonometry
Resource contains interactive programs that can be manipulated and animation to help students grasp basic concepts in trigonometry.
Windstream
Ojk's Precalculus Study Page: Sum and Difference Formulas for Sine and Cosine
An introduction to trigonometric identities, beginning with the sum and difference formulas. Some of the formulas are proven, some are left to the reader. Includes several examples and pictures.
Clark University
Clark University: Dave's Short Trig Course: Summary of Trig Identities
This Clark University page is an excellent reference page for trig identities. It is a little difficult to read so take your time with the formulas. If you remember soh - cah - toa, the other formulas are right here.
CK-12 Foundation
Ck 12: Trigonometry: Vertical Translations
[Free Registration/Login may be required to access all resource tools.] Define vertical translations of sine and cosine functions.
Varsity Tutors
Varsity Tutors: Hotmath: Graphing Calculator Practice: Right Triangles and Trigonometry
Practice using your graphing calculator for solving right triangle trigonometry and non-right triangle trigonometry. If you get stumped or if you would like to check your work, then select the View Solution button, which is located...
Math Is Fun
Math Is Fun: Triangle Identities
View examples of triangle identities, equations that are true for all triangles: Law of Sines, Law of Cosines, and Law of Tangents. Follow links to learn more about the purpose and examples of each identity.
Math Is Fun
Math Is Fun: Trigonometric Identities
A good introduction to trigonometric identities, equations that are always true for a right triangle and require knowledge of the functions sine, cosine, and tangent.
Math Is Fun
Math Is Fun: Solving Triangles
Find guidelines to help you "solve" triangles, which means finding the value of missing sides and angles. Provided are examples of six scenarios in which you can solve a triangle's missing measurements, as well as relevant equations,...
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Trigonometric Ratios
Sixteen problems cover a variety of topic of trigonometric ratios. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View Solution" button to check each...
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Law of Sines and Law of Cosines
Sixteen problems present practice working with the Law of Sines and Law of Cosines. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View Solution"...
CK-12 Foundation
Ck 12: Trigonometry: Sides of an Oblique Triangle
[Free Registration/Login may be required to access all resource tools.] This lesson covers using the Law of Cosines to find the third side of a triangle.
CK-12 Foundation
Ck 12: Geometry: Trigonometric Ratios With a Calculator Grades 8 10
[Free Registration/Login may be required to access all resource tools.] Use a calculator to find trigonometric ratios.
CK-12 Foundation
Ck 12: Trigonometry: Sine, Cosine, and Tangent Functions
[Free Registration/Login may be required to access all resource tools.] Calculate sine, cosine, and tangent functions using the sides of a right triangle.
CK-12 Foundation
Ck 12: Geometry: Sine, Cosine, Tangent
[Free Registration/Login may be required to access all resource tools.] This concept teaches students to find the sine, cosine, and tangent of right triangles.