x এর প্রেক্ষিতে $\frac{d}{d x}\left(\tan ^{-1} \frac{x}{5}\right)=?$

$\frac{1}{25+x^{2}}$

$\frac{5}{25-x^{2}}$

$\frac{5}{25+x}$

$\frac{5}{25+x^{2}}$