Activity
Massachusetts Institute of Technology

Mit: Useful Trigonometric Identities

For Students 9th - 10th
This list of trigonometric identities includes the factoring formulas near the bottom. A great tool for reference.
Activity
Analyze Math

Analyze Math: Inverse Trigonometric Functions

For Students 9th - 10th Standards
The mathematics tutorial examines inverse trigonometric functions. The tutorial consists of explorations and examples. The interactive applet allows students to investigate domain, range, and graphs of inverse trigonometric functions.
Activity
Lawrence Hall of Science

The Math Page: An Approach to Calculus: Derivatives of Inverse Trig Fx

For Students 9th - 10th
Here is a site that clearly and thoroughly explains how to find the derivatives of the six inverse trigonometric functions. There are example problems solved, problems for the student to attempt, and answers to the student problems....
Activity
Analyze Math

Analyze Math: Solve Inverse Trigonometric Functions Questions

For Students 9th - 10th Standards
The free mathematics tutorial investigates solving inverse trigonometric functions. The tutorial consists of examples with solutions, theorems, and practice exercises.
Activity
Wolfram Research

Wolfram Math World: Inverse Trigonometric Functions

For Students 9th - 10th Standards
A site on inverse trigonometric functions. Contains a definition, a chart showing functions and their domains, formulas, and many links.
Activity
Cengage Learning

Cengage: Inverse Trigonometric Functions [Pdf]

For Students 9th - 10th Standards
This site provides a presentation on inverse trigonometric functions. In the presentation students will learn to evaluate and graph the inverse sine function, other inverse trigonometric functions and the composition of trigonometric...
Activity
Other

Brown Math: Remembering Trig Identities

For Students 9th - 10th Standards
Faced with a large number of trigonometric identities, students tend to try to memorize them all. This site the emphasis is on understanding how the functions work and on memorizing only about a half dozen of them - all the others work...
Activity
Other

Karl's Calculus Tutor: Derivative of Inv. Trig Functions

For Students 9th - 10th Standards
This site provides a general overview of the derivative of inverse trig trunctions. Content includes a proof, exercises, and more.
Activity
Texas Instruments

Texas Instruments: Geometric Representation of Trig Functions

For Teachers 9th - 10th Standards
Using similar triangles, a relationship is established between the six trigonometric functions of an angle and simple line segments. These relationships are then confirmed using line segment measurement capabilities of the graphing...
Activity
Interactive Mathematics

Interactive Mathematics: Derivatives of Inverse Trig Functions

For Students 9th - 10th
The formulas for working with the derivatives of inverse trigonometry functions (arccos, arcsin, etc.) are presented here, along with several examples of how to find such derivatives. The exercises allow you to work the problems before...
Activity
University of Vienna (Austria)

Univ of Vienna: Trigonometric Functions

For Students 9th - 10th
An interactive tool to discover how the trig functions came to be. Applets are used in this interactive learning tool. Examples exercises are also given.
Activity
Other

Karl's Calculus Tutor: Trigonometric Functions

For Students 9th - 10th Standards
Great application of trig and introduction to the trig functions. Also found here are the Law of Sines and Law of Cosines as well as other trig topics to review.
Activity
Texas Instruments

Texas Instruments: Math Today When a Ruler Isn't Enough

For Teachers 9th - 10th Standards
This activity illustrates a real-life problem that uses trigonometry to solve for an unknown. students can use trigonometric ratios and inverse trigonometric relationships to determine the side of a triangle and the measure of the...
Activity
Paul Dawkins

Paul's Online Notes: Solving Trigonometric Equations

For Students 9th - 10th
n this section we will discuss solving trig equations when the answer will (generally) require the use of a calculator (i.e. they aren't one of the standard angles). Note however, the process used here is identical to that for when the...
Activity
University of St. Andrews (UK)

University of St. Andrews: Trigonometric Functions

For Students 9th - 10th Standards
This site from the University of Saint Andrews provides an historical look at the origins of trig functions. This site ties together mathematics and history from Hipparchus to Ptolemy to Lambert.
Activity
Stefan Warner and Steven R. Costenoble

Finite Mathematics & Applied Calculus: Topic Summaries: Trigonometric Functions

For Students 9th - 10th Standards
The topic summary outlines trigonometric functions. Some topics reviewed are derivatives of trigonometric functions, sine function, trigonometric identities, and indefinite integrals of trigonometric functions. The resource consists of...
Activity
University of Saskatchewan (Canada)

University of Saskatchewan: Trigonometric Functions

For Students 9th - 10th Standards
This site examines the six trigonometric functions from a right triangle point of view. Provides information, examples, and lots of exercises for understanding.
Activity
Iowa State University

Inverse Trigonometric Functions

For Students 9th - 10th Standards
This trigonometry tutorial features an explanation of how the inverse of all six of the trigonometric functions are obtained--and includes a Java applet for further reinforcement of the concept.
Activity
Windstream

Ojk's Pre Calculus Study Page: The Four Other Trig Functions

For Students 9th - 10th Standards
Trigonometry ratios and their signs are given in this explanation of the other trig functions. Graphs of tangent, cotangent, secant, and cosecant are given. Examples are included.
Activity
Curated OER

Zona Land: Overlapped Graph of the Six Trig Functions

For Students 9th - 10th Standards
An overview of the six trig functions and their graphs. The site is a little difficult to navigate but is good for finding a graph of a trig function.
Activity
Texas Instruments

Texas Instruments: Phases of the Moon

For Teachers 9th - 10th
In this TI InterActive! activity, students study the phases of the moon, plot the fraction of the moon showing each day in a month, and fit the data with an appropriate trigonometric function.
Activity
Interactive Mathematics

Interactive Mathematics: Trigonometric Functions

For Students 9th - 10th Standards
This is a excellent review lesson about trigonometric functions of any angle. Good examples here.
Activity
Interactive Mathematics

Interactive Mathematics: Trigonometric Functions

For Students 9th - 10th
Just about everything you need to know about trigonometry can be found here. Interactive examples and demonstrations help to enhance the lessons. Although not required, the tutorial uses Live Math and Scientific Notebook.
Activity
Discovery Education

Discovery Education: Web Math: Try to Simplify a Trigonometric Expression

For Students 9th - 10th
This WebMath site is a java program that will simplify a trig expression. This is a good site to use to check answers to problem sets. Read the site instructions carefully.