Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/MathTrig.php
public static function POWER($x = 0, $y = 2)
    {
        $x = Functions::flattenSingleValue($x);
        $y = Functions::flattenSingleValue($y);

        // Validate parameters
        if ($x == 0.0 && $y == 0.0) {
            return Functions::NAN();
        } elseif ($x == 0.0 && $y < 0.0) {
            return Functions::DIV0();
        }

        // Return
        $result = pow($x, $y);

        return (!is_nan($result) && !is_infinite($result)) ? $result : Functions::NAN();
    }
public static function POWER($x = 0, $y = 2)
    {
        $x = Functions::flattenSingleValue($x);
        $y = Functions::flattenSingleValue($y);

        // Validate parameters
        if ($x == 0.0 && $y == 0.0) {
            return Functions::NAN();
        } elseif ($x == 0.0 && $y < 0.0) {
            return Functions::DIV0();
        }

        // Return
        $result = pow($x, $y);

        return (!is_nan($result) && !is_infinite($result)) ? $result : Functions::NAN();
    }
POWER.

Computes x raised to the power y.

@param float $x
@param float $y

@return float