Tangent.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig\Trig;

use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Calculation\MathTrig\Helpers;

class Tangent
{
    public static function tan($angle)
    {
        try {
            $angle = Helpers::validateNumericNullBool($angle);
        } catch (Exception $e) {
            return $e->getMessage();
        }

        return Helpers::verySmallDenominator(sin($angle), cos($angle));
    }

    public static function tanh($angle)
    {
        try {
            $angle = Helpers::validateNumericNullBool($angle);
        } catch (Exception $e) {
            return $e->getMessage();
        }

        return tanh($angle);
    }

    public static function atan($number)
    {
        try {
            $number = Helpers::validateNumericNullBool($number);
        } catch (Exception $e) {
            return $e->getMessage();
        }

        return Helpers::numberOrNan(atan($number));
    }

    public static function atanh($number)
    {
        try {
            $number = Helpers::validateNumericNullBool($number);
        } catch (Exception $e) {
            return $e->getMessage();
        }

        return Helpers::numberOrNan(atanh($number));
    }

    public static function atan2($xCoordinate, $yCoordinate)
    {
        try {
            $xCoordinate = Helpers::validateNumericNullBool($xCoordinate);
            $yCoordinate = Helpers::validateNumericNullBool($yCoordinate);
        } catch (Exception $e) {
            return $e->getMessage();
        }

        if (($xCoordinate == 0) && ($yCoordinate == 0)) {
            return Functions::DIV0();
        }

        return atan2($yCoordinate, $xCoordinate);
    }
}