যদি, $y=\tan ^{-1} \frac{5+6 x}{6-5 x}$ হয়, তবে $\begin{array}{l}\frac{dy}{dx}\end{array}$ এর মান কত?

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

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

$\frac{5}{6\left(1+x^{2}\right)}$

$\text { None of these }$