Trigonometry expression

Geometry Level 1

$\tan{\theta}$

Which identity is equal to the above expression?

\text{}1-{\cos}^{2}{\theta}

\frac{\cos{\theta}}{\sin{\theta}}

\text{}{\cos}^{2}{\theta}+{\sin}^{2}{\theta}

\frac{\sin{\theta}}{\cos{\theta}}

\text{}1-{\sin}^{2}{\theta}