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'''Trigonometry''' is the study of angles and [[triangle]]s, relying heavily on three basic functions: [[sine]], [[cosine]] and [[tangent]]. These functions are abbreviated as "sin", "cos" and "tan".
'''Trigonometry''' is the study of angles and [[triangle]]s, relying heavily on three basic functions: [[sine]], [[cosine]] and [[tangent]], and their inverses, [[Cotangent]] (Cot), [[Secant]] (sec) and [[Cosecant]] (csc). These functions are abbreviated as "sin", "cos" and "tan".
These functions are defined by reference to a "right triangle," which is a triangle in which one angle is 90 degrees.
These functions are defined by reference to a "right triangle," which is a triangle in which one angle is 90 degrees.