You may have recognized that the given graph passes through the origin, as does the graph of $\displaystyle{y}={\sin{\theta}}\usepackage{cmbright}\Huge\$ . However, the given graph has a valley just to the right of the y-axis, while the graph of $\displaystyle{y}={\sin{\theta}}\usepackage{cmbright}\Huge\$ has a hill just to the right of the y-axis.