$y=\tan (x+y)$ হলে $\mathrm{dy} / \mathrm{dx}=?$

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

$-\left(1+\frac{1}{y^{2}}\right)$

$\frac{1-y^{2}}{y^{2}}$

$1+\frac{1}{y}$