code: public static function SQRTPI($number)
      {
          $number = Functions::flattenSingleValue($number);
  
          if (is_numeric($number)) {
              if ($number < 0) {
                  return Functions::NAN();
              }
  
              return sqrt($number * M_PI);
          }
  
          return Functions::VALUE();
      }
docs: SQRTPI.
  
  Returns the square root of (number * pi).
  
  @param float $number Number
  
  @return float Square Root of Number * Pi