Litipk\BigNumbers\Decimal::cosec PHP Method

    public function cosec($scale = null)
    {
        $sin = $this->sin($scale + 2);
        if ($sin->isZero()) {
            throw new \DomainException("The cosecant of this 'angle' is undefined.");
        }
        return DecimalConstants::one()->div($sin)->round($scale);
    }