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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.
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.
WHAT ARE THE TANGENTS OF ALL COORDINATES IN THE UNIT CIRCLE?
Here is a time-line that shows the history of the unit circle dating back to 250 B.C.
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