Abstract
In this short paper we given a new approximate definition of sinିଵ ݔas afunction of √ ,ݔ1 − ݔଶ which
avoids imaginary units and natural logarithm that found in Euler formula result for all sinିଵ ∈ ݔቂ0, గ ଶቃ ,
therefore it will be interest add to many applied fields.