Full trip across the unit circle.........through its center...........is a distance of 2..........................1 and 2...........like 1/2...........the critical line...........
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In mathematics, a unit circle is a circle with a radius of one. Frequently, especially in trigonometry, the unit circle is the circle of radius one centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane.
https://en.wikipedia.org/wiki/Unit_circle
https://www.mathsisfun.com/geometry/unit-circle.html
Sine, Cosine and Tangent. Because the radius is 1, we can directly measure sine, cosine and tangent. unit circle center angle 0. What happens when the angle, θ, is 0°? cos 0° = 1, sin 0° = 0 and tan 0° = 0. unit circle center angle 90. What happens when θ is 90°? cos 90° = 0, sin 90° = 1 and tan 90° is undefined ...
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