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Precalculus: The Unit Circle

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Horizontales
The graph of a function that is symmetric with respect to the origin, f(-x) = -f(x).
A function that repeats its values in regular intervals or periods.
The measure of the central angle of a circle that intercepts an arc equal in length to the radius of the circle.
An equation that is true for all real numbers for which the trigonometric expression in the equation is defined.
Two trigonometric functions that are complements of each other.
The positive acute angle formed by the terminal side of an angle and the x-axis.
The vertex of an angle is at the origin and the initial side lies along the positive x-axis.
Verticales
An angle whose terminal side lies on the x-axis or on the y-axis.
Two angles with the same initial and terminal sides but possible different rotations.
The graph of a function that is symmetric with respect to the y-axis, f(-x) = f(x).
Two positive angles whose sum is 90 degrees.
A circle of radius 2 with its center at the origin of a rectangular coordinate system.