$$co\sec^{2}\theta=1+\cot^{2}\theta$$
$c=\frac{\frac{1}{\left(\sin(\theta )\right)^{2}}-1}{o}$
$o\neq 0\text{ and }\nexists n_{1}\in \mathrm{Z}\text{ : }\theta =\frac{\pi n_{1}}{2}$
$o=\frac{\frac{1}{\left(\sin(\theta )\right)^{2}}-1}{c}$
$c\neq 0\text{ and }\nexists n_{1}\in \mathrm{Z}\text{ : }\theta =\frac{\pi n_{1}}{2}$
