$$(\sin^{2}\theta+\tan^{2}\theta)^{2}-\tan^{4}\theta$$
$\left(\sin(\theta )\right)^{2}\left(\tan(\theta )\right)^{2}\left(\left(\cos(\theta )\right)^{2}+2\right)$
$2\left(\sin(\theta )\right)^{2}\left(\tan(\theta )\right)^{2}+\left(\sin(\theta )\right)^{4}$
