411 REFERENCE · Wikibooks
High School Trigonometry/General Definitions of Inverse Trigonometric Functions
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
General Definitions of Inverse Trig Functions
Ordinary trigonometric functions yield a value after inputting an angle(1). Inverse trigonometric functions yield an angle after inputting a value(2).
1:
2:
As seen above, the notation for the inverse of a trigonometric function is to simply put the letters arc in front of the function name. Sometimes, just an a is used: asin. It may also be represented by a superscripted -1 over the function. For example, sin-1(x)
Inverse functions exist for all 6 trigonometric functions.