a) sin 111°= sin(180°- [] ) b) sin 132°= sin(180 - [] ) c) cos 123°= - cos( 180°- [] ) d) cos 107° = - cos(180° - [] )

[latex]a) sin111^{o} = sin(180^{o}-69^{o}) = sin69^{o}\\b) sin132^{o} = sin(180^{o}-48^{o})=sin48^o}\\c) cos123^{o} = cos(180^{o}-57^{o}) = -cos57^{o}\\d) cos107^o} = cos(180^{o}-73^{o}) = -cos73^{o}[/latex]