fasinh static method
Implementation
static double fasinh( double x ){
if( x > _eps5 ){
return ClipMath.log( ClipMath.sqrt( x * x + 1.0 ) + x );
}
if( x < -_eps5 ){
return -ClipMath.log( ClipMath.sqrt( x * x + 1.0 ) - x );
}
return x * (1.0 - x * x / 6.0);
}