$$\tan \theta . \cos \theta . \csc \theta$$
$\frac{1}{\left(\cos(\theta )\right)^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}\theta }(\frac{\sin(\theta )}{\cos(\theta )})$$
$$\frac{\cos(\theta )\frac{\mathrm{d}}{\mathrm{d}\theta }(\sin(\theta ))-\sin(\theta )\frac{\mathrm{d}}{\mathrm{d}\theta }(\cos(\theta ))}{\left(\cos(\theta )\right)^{2}}$$
$$\frac{\cos(\theta )\cos(\theta )-\sin(\theta )\left(-\sin(\theta )\right)}{\left(\cos(\theta )\right)^{2}}$$
$$\frac{\left(\cos(\theta )\right)^{2}+\left(\sin(\theta )\right)^{2}}{\left(\cos(\theta )\right)^{2}}$$
$$\frac{1}{\left(\cos(\theta )\right)^{2}}$$
$$\left(\sec(\theta )\right)^{2}$$
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$\tan(\theta )$
