What is the unit circle definition of the trigonometric functions? The unit circle definition allows us to extend the domain of sine and cosine to all real numbers.

By definition, the unit circle has a radius of 1. A circle with radius 3 isn't a unit circle.

Discover how to measure angles, distances, and heights using trigonometric ratios and the unit circle. Learn how to use sine, cosine, and tangent to solve real-world problems involving …

What are unit circle trigonometry problems? The problems in this lesson involve circles and angle measures in radians, a unit for angle measure much like degrees.

The unit circle is used to help you find the exact values of trig functions of special angles (0°, 30°, 45°, 60°, 90° or their radian counterparts) and the multiples of those special angles.

Well the unit circle definition of trig functions in this angle, this pi over four radians, is forming an angle with the positive X axis. And where it's terminal ray intersects the unit circle, the X and Y …

But in unit circle definition, the trigonometric functions sine and cosine are defined in terms of the coordinates of points lying on the unit circle x^2 + y^2=1.

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

Practice your understanding of the unit circle definition of sine and cosine.

About this unit Learn about the definition of the basic trigonometric functions (sin (x), cos (x), and tan (x)), and use advanced trigonometric functions for various purposes.