Here is a time-line that shows the history of the unit circle dating back to 250 B.C.
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It is unknown who created the unit circle. Pythagoras did a lot of work related to the unit circle. In ancient times, Greek, Indian, and Arabian mathematicians used the unit circle.
The unit circle is a circle that can be used to find trigonometric functions. The equation of the unit circle is x^2 + y^2 = 1. So it is any circle with radius 1.
WHAT ARE THE TANGENTS OF ALL COORDINATES IN THE UNIT CIRCLE?
1
A=u^x/360