Purple Math
Purplemath: Inverses of Trigonometric Ratios
You know that you can take side lengths and find trig ratios, and you know you can find trig ratios (in your calculator) for angles. What is missing is a way to go from the ratios back to the original angles. And that is what "inverse...
Johan Claeys
Math Abundance: Inverse Trigonometric Functions = Cyclometric Functions
Explains the inverse trigonometric functions using examples.
Paul Dawkins
Paul's Online Notes: Derivatives of Inverse Trig Functions
Online notes with examples and solutions.
Paul Dawkins
Paul's Online Notes: Solving Trigonometric Equations
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...
Windstream
Ojk's Pre Calculus Study Page: The Four Other Trig Functions
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.
Illustrative Mathematics
Illustrative Mathematics: G Srt Finding the Area of an Equilateral Triangle
This task examines how to calculate the area of an equilateral triangle two ways: using triangle congruence and using trigonometric ratios. Aligns with G-CO.C.10 and G-SRT.C.
Khan Academy
Khan Academy: Trigonometric Ratios in Right Triangles
Learn how to find the sine, cosine, and tangent of angles in right triangles.
CK-12 Foundation
Ck 12: Exact Values for Inverse Sine, Cosine, and Tangent
[Free Registration/Login may be required to access all resource tools.] Find all angles on the unit circle matching exact trig ratios. Resource includes examples, videos, and practice problems.
Oswego City School District
Regents Exam Prep Center: Unit Circle
Two hands-on lab activities for instructors to use when teaching about the coordinate graphs of the sine, cosine, and tangent functions derived from a unit circle. The graphs of the reciprocals of the three functions are investigated....
Khan Academy
Khan Academy: Solving for a Side in Right Triangles With Trigonometry
Learn how to use trig functions to find an unknown side length in a right triangle.
University of Guelph
University of Guelph: Trigonometry Tutorial
A guide to calculating trigonometric functions.
Other
Mecca: Review for Trigonometric Functions
A page of review problems on trigonometric functions. Answers are supplied.