The graph of $\displaystyle{y}={\cos{{\left(\theta-\frac{\pi}{{2}}\right)}}}\usepackage{cmbright}\Huge\$ is the same as the graph of $\displaystyle{y}={\cos{\theta}}\usepackage{cmbright}\Huge\$ shifted by

$\displaystyle\frac{\pi}{{2}}\usepackage{cmbright}\Huge\$ units to the right. This will result in a repeating valley and hill pattern, with a hill just to the right of the y-axis, and a valley just to the left. This matches the given graph.