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