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...

This site contains graphs of the exponential function, identities relevant to the function, and the Maclaurin series for this function.

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.

[Free Registration/Login may be required to access all resource tools.] Advanced applications of trigonometric identities.

Learners use the given figure and a straightedge to approximate the values of each trigonometric function. The figure is available in PDF format.

Learners use the given figure and a straightedge to approximate the values of each trigonometric function. The figure is available in PDF format.

Here is a site that clearly and thoroughly explains the trigonometry of a right triangle, including finding the values of all six trig functions given a single value. There are example problems solved, problems for the student to...

An introduction to solving acute and obtuse triangles by using the law of cosines, including a derivation of the formula. Includes several pistures and examples.

[Free Registration/Login may be required to access all resource tools.] Finding the value for trigonometric functions for angles exceeding 360 degrees.

[Free Registration/Login may be required to access all resource tools.] Learn how to define trigonometric functions of angles with negative values.

[Free Registration/Login may be required to access all resource tools.] Determine if three side lengths make a right triangle, and given the length of its legs, find the length of a right triangle's hypotenuse.

An introduction to viewing the complex plane in terms of polar coordinates. Assumes knowledge of the conversion formulas. Includes several examples and pictures.

An introduction to DeMoivre's Theorem for quickly finding the powers of complex numbers. Assumes knowledge of polar form of complex numbers. Includes several examples and pictures.

The practice problem uses a straightedge and a figure to approximate the solution of each equation. The figure is available in PDF format.

The practice problem uses a straightedge and a figure to approximate the solution of each equation. The figure is available in PDF format.