The unit circle definition of sine, cosine, and tangent

Progress
Introduction to radians
The unit circle definition of sine, cosine, and tangent
The graphs of sine, cosine, and tangent
Basic trigonometric identities
Trigonometric values of special angles
The Pythagorean identity
Long live Tau
Unit test
10 questions

Unlock your personalized study plan

Take a test to identify your areas for growth. We'll recommend lessons for exactly what you need to learn.
Test your understanding of The unit circle definition of sine, cosine, and tangent with these 10 questions.
About this unit
Learn how the trigonometric ratios are extended to all real numbers using algebra. Start solving simple problems that involve this new definition of the trigonometric functions.