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In trigonometry, secant refers to one over cosine. It can also refer to a straight line that intersects a curve at two or more points.
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Cosine: Cosine is one of the basic trigonometric functions which represents ratios between sides in right triangles.
Unit Circle: A circle with radius 1 unit centered at origin used for studying angles and trigonometric functions.
Periodic Function: A function that repeats its values after certain intervals called periods.