$$\frac { \cos \theta } { 1 - \sin \theta } + \frac { \cos \theta } { 1 + \sin \theta }$$
$\frac{2}{\cos(\theta )}$
$\frac{2\sin(\theta )\left(\left(\sin(\theta )\right)^{2}+\cos(2\theta )\right)}{\left(-\left(\sin(\theta )\right)^{2}+1\right)^{2}}$
