, is one-one and its range is [–1, 1] We can,
therefore, define the inverse of sine function in each of these intervals We denote the
inverse of sine function by sin–1 (arc sine function) Thus, sin–1 is a function whose
domain is [– 1, 1] and range could be any of the intervals 
23 ,
2
− π −π





, 
2,
2
−π π





 or
2,3
2
π
π






, and so on