$\tan \theta+\sec \theta=x$ হলে $\operatorname{cosec} \theta$ এর মান কত

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

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

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

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