// Returns the arcsine of a number.
// @param {Number} $x A number between -1 and 1.
// @example
//     asin(0.1) // 0.10017
//     asin(-1)  // -1.5708
@use "sass:math";

@function asin ($x){
  @if $x > 1 or $x < -1{
    @warn "Argument for `asin()` must be a number between -1 and 1";

    @return null;
  }

  @return atan(math.div($x, sqrt(1 - $x * $x)));
}