Windstream
Ojk's Precalculus Study Page: Easier Trigonometric Equations
An introduction to solving trigonometric equations, including finding general and particular solutions. The connection between the tangent function and the slope of a line is also covered. Includes several examples and graphs.
Windstream
Ojk's Precalculus Study Page: More Difficult Trig Equations
An introduction to solving trigonometric equations by using the reciprocal, negative, Pythagorean, and cofunction identities. Includes several examples and exercises with solutions at the bottom of the page.
University of Regina (Canada)
Univeristy of Regina: Math Central: Tangent Lines and Circle Equations
This site offers a problem and solution to finding all possible slopes for a line tangent to a circle given a particular equation of a circle. Could be an interesting challenge for students.
Math Medics
S.o.s. Math: Trigonometry
This lesson is the main SOS Math page for trigonometry. Surf the lesson to find most any trigonometric identity, formula, and many forms of help in the area of trigonometry.
Purple Math
Purplemath: Conics: Circles: Introduction & Drawing
A reference site that gives definitions, examples, explanation of circle attributes and drawing circles in a coordinate plane.
Other
Mecca: Review for Trigonometric Functions
A page of review problems on trigonometric functions. Answers are supplied.
Math Graphs
Houghton Mifflin: Math Graphs: Tangent Line 3 [Pdf]
Students use a given graph and point to find an equation of the tangent line. The math graph is available in PDF format.
Math Graphs
Houghton Mifflin: Math Graphs: Tangent Line 4 [Pdf]
Students use a given graph and point to find an equation of the tangent line. The math graph is available in PDF format.
Math Graphs
Houghton Mifflin: Math Graphs: Tangent Line 5 [Pdf]
Students determine the equation of the tangent line to the graph at a given point. The handout includes a graph that is available in PDF format.
Math Graphs
Houghton Mifflin: Math Graphs: Tangent Line 6 [Pdf]
Students determine the equation of the tangent line to the graph at a given point. The handout includes a graph that is available in PDF format.
Math Graphs
Houghton Mifflin: Math Graphs: Tangent Line 7 [Pdf]
The exercise explores the equation of the tangent line at a given point and graph. The handout includes a graph that is available in PDF format.
Math Graphs
Houghton Mifflin: Math Graphs: Tangent Line 8 [Pdf]
The exercise explores the equation of the tangent line at a given point and graph. The handout includes a graph that is available in PDF format.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Trigonometric Ratios
Find a quick, concise explanation of the trigonometric ratios: sine, cosine and tangent. Examples are given and clearly explained.
Interactive Mathematics
Interactive Mathematics: Trigonometric Functions of Any Angle
Given a reference angle, you can find the trigonometric functions of any angle. The process is demonstrated in this lesson and examples are provided for practicing the concept.
BBC
Bbc: The Circle
The equation of a circle is the focus of this site. Topics include tangents, intersecting circles, and intersection of lines and circles. Examples and a practice test are available.
Walter Fendt
Walter Fendt: Sine, Cosine and Tangent of an Angle
A short interactive activity to visualize the trigonometric functions: sine, cosine, and tangent.
Math Open Reference
Math Open Reference: Secant
Learn about secants with this helpful reference tool. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.
Calculator Soup
Calculator Soup: Trigonometric Functions Calculator
This online trigonometry calculator will calculate the sine, cosine, tangent, cotangent, secant and cosecant of values. The trigonometric functions are also known as the circular functions.
Oswego City School District
Regents Exam Prep Center: Formulas for Angles in Circles
Formulas and illustrations show the different kinds of angles created by intersecting tangents, secants, radii, and in combination.