n mathematics, the trigonometric functions (also called the circular functions) are functions of an angle. They relate the angles of a triangle to the lengths of its sides. Trigonometric functions are important in the study of triangles and modeling periodic phenomena, among many other applicatio

here are six functions that are the core of trigonometry. There are three primary ones that you need to understand completely: Sine  (sin)Cosine  (cos)Tangent  (tan) The other three are not used as often and can be derived from the three primary functions. Because they can easily be derived, calculators and spreadsheets do not usually have them. Secant  (sec)Cosecant  (csc)Cotangent  (cot) All six functions have three-letter abbreviations (shown in parentheses above).
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