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Learn Trigonometry for Free


Find resources here that will help you understand the math that governs lines, shapes, and 3D objects and their interactions, as well as trigonometric ratios, equations, and trigonometric intervals. Find trigonometry cheat sheets, trigonometry calculators, examples, word problems, charts, and other resources. Whether you're in high school or learning college trigonometry, we have you covered.

Graphs of trigonometric functions

High School - College | Online class

Sal draws the graph of the tangent function based on the unit circle definition of the function.

Free

Trigonometric equations and identities

High School - College | Online class

Learn about the inverse functions of sine, cosine, and tangent, and how they are defined even though the functions are not really invertible. These functions will be very helpful when you will...

Free

Trigonometric equations and identities

High School - College | Online class

Learn about the inverse functions of sine, cosine, and tangent, and how they are defined even though the functions are not really invertible. These functions will be very helpful when you will...

Free

Trigonometry

7th - High School | Online class

Missions recommend what to learn next, help you remember what you’ve learned by mixing skills, and save your progress.

Free

Trigonometry

7th - High School | Online resource

Free, interactive video lessons on trigonometry! Trigonometry helps you understand any topic that involves distances, angles, or waves. The trig functions (sin, cos, and tan) show up all over...

Free

Trigonometry

9th - High School | Online video/YouTube

172 videos about all aspects of Trigonometry.

Free

Trigonometry Help

7th - High School | Online resource

Trying to keep up with trig can be hard at first — suddenly you’re learning new terms like sine, cosine, and tangent, and having to figure out more triangles than you ever cared about. Fortunately...

Free

Trigonometry with general triangles

5th - 8th | Online class

Learn about the Law of sines and how to use it in order to find missing side lengths and angles in general triangles.

Free

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