Unit Circle

Intro

A unit circle is a circle with the radius of 1. A unit circle has radians, degrees, and coordinates.

Sample Problem

In the interval 0<=x<360, when is cot x is undefined?

Solution

It is 0 and 180.
-In a unit circle, 0 and 360 degrees has the coordinate of (1,0); 90 degrees has the coordinate of (0,1); 180 degrees has the coordinate of (-1,0); 270 degrees has the coordinate of (0,1).
-The denominator must be zero and any number that is not zero in the numerator can have the answer to be undefined.
-Tan x is sin x/cos x.
-Cot x is the co-function of tan x, so it is 1/sin x/cos x or cos x/sin x.



About The Author

Math, Biology, And History Instructor
Hello. I am Kisung Yoon, and I am a senior in high school. I am currently in the ARISTA Honor Society, and I have tutored my fellow students from my school in Algebra I, Algebra 2, Global History, US History, and Biology. Not only that, I also tutored my younger sisters on the standardized tests mai...
10 Subjects
KnowRo Tutor
30 Tutorials
Queens, NY
Get Tutoring Info

Suggested Tutors for Trigonometry Help

Abdul B

Arlington, VA

Math And Science Expert

Siddarth C

Vienna, VA

All Subjects

Sophia G

Washington, DC

General Tutor

Emily V

Alexandria, VA

Versatile And Flexible Tutor

^