For which values of $\displaystyle\theta\usepackage{cmbright}\Huge\$ in the interval $\displaystyle-{4}\pi\le\theta\le-{2}\pi\usepackage{cmbright}\Huge\$ is the function $\displaystyle{y}={\sin{\theta}}\usepackage{cmbright}\Huge\$ equal to 1 and $\displaystyle-{1}\usepackage{cmbright}\Huge\$ ?