Trigonometry For Dummies by ItzelS
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This document provides an introduction to trigonometry by defining key terms and concepts. It explains that trigonometry deals with angles and sides of triangles. It then introduces reference angles as the acute angle formed by the terminal side and x-axis, and how to find a reference angle by subtracting an obtuse angle from 180 or 360 degrees. It also defines coterminal angles as angles that share the same initial and terminal sides, and can be positive or negative depending on the direction of rotation. Finally, it briefly outlines sine, cosine, and tangent on the unit circle and their relationships.
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