ASin (arcus sinus)
  

Returns arcsine (value of angle of given sinus number).

syntax
ASin(sinus)

input
real number range <-1,1> radian

returns
real number range:
- radian: <-Pi/2,Pi/2>
- degree: <-90,90>
- gradus: <-100,100>

example
ASin(1) = 90 when measure of angle is degree.