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what is a trigonometry? what is inverse trigonometry?

Trigonometry is a branch of mathematics that studies triangles and their relationships between their sides and the angles between these sides. Trigonometry defines the trigonometric functions, which describe those relationships and have applicability to cyclical phenomena, such as waves
the inverse trigonometric functions are the inverse functions of the trigonometric functions with suitably restricted domains.The notations sin?1, cos?1, etc. are often used for arcsin, arccos, etc., but this convention logically conflicts with the common semantics for expressions like sin2(x), which refer to numeric power rather than function composition, and therefore may result in confusion between multiplicative inverse and compositional inverse.


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