An acute angle $\displaystyle\theta\usepackage{cmbright}\Huge\$ is shown below in standard position, together with a unit circle.

In terms of the variables x and/or y, what is $\displaystyle{\cos{\theta}}\usepackage{cmbright}\Huge\$ equal to?

$\displaystyle{\cos{\theta}}=\usepackage{cmbright}\Huge\$ _____