What is the unit circle definition of the trigonometric functions Sal finds several trigonometric identities for sine and cosine by considering horizontal and vertical symmetries of the unit circle. The unit circle definition allows us to extend the domain of sine and cosine to all real numbers.
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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.
Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers For each point on the unit circle, select the angle that corresponds to it Click each dot on the image to select an answer. In short, the unit circle of an extension of the methods used to figure out the angles of right triangles
Sal has many videos explaining this very process on his trigonometry course if anyone is interested. Sal shows how, for acute angles, the two different definitions of the trigonometric values (soh cah toa and the unit circle definition) result in the same values
