+118667 Not sure what you mean but arcsine is just the inverse of sin
\(asin[sin\theta]=\theta \)
sin (angle)=ratio (number)
asin (ratio) = angle
sometimes asin is written as \(sin^{-1}\)
arc sine is the same as inverse sine
On a calculator you would normally press Inv or 2nd and then the sine button if you want inverse sin.
